PHP\u3067\u306f\u3001\u9759\u7684\u30e1\u30bd\u30c3\u30c9(\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9)\u306e\u4e2d\u30673\u3064\u306e\u7279\u5225\u306a\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u4f7f\u3048\u307e\u3059<\/p>\n
self::<\/code><\/li>\nparent::<\/code><\/li>\nstatic::<\/code><\/li>\n<\/ul>\nself::<\/code> \u3068 static::<\/code> \u3092\u6df7\u540c\u3057\u3066\u3044\u308b\u4eba\u304c\u591a\u3044\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u7121\u8ad6\u5225\u7269\u3067\u3059\u3002<\/p>\n\u4eca\u56de\u306e\u7126\u70b9\u306f\u300cstatic::<\/code>\u300d\u3067\u3059\u3002\u3053\u306estatic::<\/code> \u3092\u4f7f\u3046\u3068\u300c\u9045\u5ef6\u9759\u7684\u675f\u7e1b (Late Static Bindings)<\/strong>\u300d\u306a\u308b\u6a5f\u80fd\u3092\u4f7f\u3046\u3053\u3068\u306b\u306a\u3063\u3066\u307e\u3059\u3002<\/p>\n\u306f\u3066\u2026 \u4f55\u3084\u3089\u5c0f\u96e3\u3057\u305d\u3046\u306a\u30ef\u30fc\u30c9\u3067\u3059\u3002\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b\u3088\u308c\u3070<\/p>\n
PHP 5.3.0 \u4ee5\u964d\u3001PHP \u306b\u9045\u5ef6\u9759\u7684\u675f\u7e1b\u3068\u547c\u3070\u308c\u308b\u6a5f\u80fd\u304c\u642d\u8f09\u3055\u308c\u307e\u3059\u3002 \u3053\u308c\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u9759\u7684\u7d99\u627f\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3067\u547c\u3073\u51fa\u3057\u5143\u306e\u30af\u30e9\u30b9\u3092\u53c2\u7167\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u3088\u308a\u6b63\u78ba\u306b\u8a00\u3046\u3068\u3001\u9045\u5ef6\u9759\u7684\u675f\u7e1b\u306f\u76f4\u8fd1\u306e “\u975e\u8ee2\u9001\u30b3\u30fc\u30eb” \u306e\u30af\u30e9\u30b9\u540d\u3092\u4fdd\u5b58\u3057\u307e\u3059\u3002 \u9759\u7684\u30e1\u30bd\u30c3\u30c9\u306e\u5834\u5408\u3001\u3053\u308c\u306f\u660e\u793a\u7684\u306b\u6307\u5b9a\u3055\u308c\u305f\u30af\u30e9\u30b9 (\u901a\u5e38\u306f :: \u6f14\u7b97\u5b50\u306e\u5de6\u5074\u306b\u66f8\u304b\u308c\u305f\u3082\u306e) \u3068\u306a\u308a\u307e\u3059\u3002\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u4ee5\u5916\u306e\u5834\u5408\u306f\u3001\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30af\u30e9\u30b9\u3068\u306a\u308a\u307e\u3059\u3002 “\u8ee2\u9001\u30b3\u30fc\u30eb” \u3068\u306f\u3001self:: \u3084 parent::\u3001static:: \u306b\u3088\u308b\u9759\u7684\u306a\u30b3\u30fc\u30eb\u3001 \u3042\u308b\u3044\u306f\u30af\u30e9\u30b9\u968e\u5c64\u306e\u4e2d\u3067\u306e forward_static_call() \u306b\u3088\u308b\u30b3\u30fc\u30eb\u306e\u3053\u3068\u3067\u3059\u3002 get_called_class() \u95a2\u6570\u3092\u4f7f\u3046\u3068\u30b3\u30fc\u30eb\u5143\u306e\u30af\u30e9\u30b9\u540d\u3092\u6587\u5b57\u5217\u3067\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002 static:: \u306f\u3053\u306e\u30af\u30e9\u30b9\u306e\u30b9\u30b3\u30fc\u30d7\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u3053\u306e “\u9045\u5ef6\u9759\u7684\u675f\u7e1b” \u3068\u3044\u3046\u6a5f\u80fd\u540d\u306f\u3001\u5185\u90e8\u52d5\u4f5c\u3092\u8003\u616e\u3057\u3066\u3064\u3051\u3089\u308c\u305f\u3082\u306e\u3067\u3059\u3002 “\u9045\u5ef6\u675f\u7e1b (Late binding)” \u306e\u7531\u6765\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u308b\u30af\u30e9\u30b9\u540d\u3092\u4f7f\u7528\u3057\u3066\u3082 static:: \u306e\u89e3\u6c7a\u304c\u3067\u304d\u306a\u3044\u3053\u3068\u306b\u3088\u308a\u307e\u3059\u3002 \u305d\u306e\u4ee3\u308f\u308a\u306b\u3001\u5b9f\u884c\u6642\u60c5\u5831\u3092\u3082\u3068\u306b\u89e3\u6c7a\u3059\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002 “\u9759\u7684\u675f\u7e1b (static binding)” \u306e\u7531\u6765\u306f\u3001 \u9759\u7684\u30e1\u30bd\u30c3\u30c9\u306e\u30b3\u30fc\u30eb\u306b\u4f7f\u7528\u3067\u304d\u308b\u3053\u3068\u306b\u3088\u308a\u307e\u3059 (\u305f\u3060\u3057\u3001\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u4ee5\u5916\u3067\u3082\u4f7f\u7528\u53ef\u80fd\u3067\u3059)\u3002<\/p><\/blockquote>\n
\u3060\u305d\u3046\u3067\u3059\u3002<\/p>\n
\u306f\u3044\uff01\u5206\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f\uff01<\/p>\n
\u9045\u5ef6\u9759\u7684\u675f\u7e1b\u3092\u4f7f\u308f\u306a\u3044\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u518d\u78ba\u8a8d<\/h2>\nself::<\/h3>\n
\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b\u5206\u304b\u308a\u3084\u3059\u3044\u89e3\u8aac\u304c\u3042\u3063\u305f\u306e\u3067\u3001\u305d\u306e\u307e\u307e\u5f15\u7528\u3057\u307e\u3059\u3002<\/p>\n
self:: \u3042\u308b\u3044\u306f __CLASS__ \u306b\u3088\u308b\u73fe\u5728\u306e\u30af\u30e9\u30b9\u3078\u306e\u9759\u7684\u53c2\u7167\u306f\u3001 \u305d\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u5c5e\u3059\u308b\u30af\u30e9\u30b9 (\u3064\u307e\u308a\u3001 \u305d\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u30af\u30e9\u30b9) \u306b\u89e3\u6c7a\u3055\u308c\u307e\u3059\u3002<\/p><\/blockquote>\n
\u4f7f\u7528\u4f8b:<\/p>\n
class A\r\n{\r\n public static function print_class_name()\r\n {\r\n echo self::class . PHP_EOL;\r\n }\r\n}\r\n\r\nclass B extends A\r\n{\r\n}\r\n\r\nclass C extends B\r\n{\r\n}\r\n\r\nA::print_class_name(); \/\/ => A\r\nB::print_class_name(); \/\/ => A\r\nC::print_class_name(); \/\/ => A<\/pre>\n\u3053\u306e\u4f8b\u304b\u3089\u5206\u304b\u308b\u3053\u3068\u306f\u3001self::<\/code>\u304c\u8868\u3059\u30af\u30e9\u30b9\u306f\u5e38\u306bself::<\/code>\u304c\u8a18\u8f09\u3055\u308c\u305f\u30af\u30e9\u30b9\u3067\u3042\u308b\u3002<\/p>\n\u3044\u3044\u306d\uff01\u5b9f\u306b\u89e3\u304b\u308a\u3084\u3059\u3059\u304e\u3067\u3059\uff01<\/p>\n
parent::<\/h3>\n
parent::<\/code>\u304c\u8868\u3059\u30af\u30e9\u30b9\u306f\u5e38\u306bparent::<\/code>\u304c\u8a18\u8f09\u3055\u308c\u305f\u30af\u30e9\u30b9\u306e\u89aa\u30af\u30e9\u30b9\u3067\u3042\u308b\u3002<\/p>\n\u4f7f\u7528\u4f8b\uff1a<\/p>\n
class A\r\n{\r\n\r\n}\r\n\r\nclass B extends A\r\n{\r\n public static function print_parent()\r\n {\r\n echo parent::class . PHP_EOL;\r\n }\r\n}\r\n\r\nclass C extends B\r\n{\r\n public static function print_parent()\r\n {\r\n parent::print_parent();\r\n }\r\n}\r\n\r\nB::print_parent(); \/\/ => A\r\nC::print_parent(); \/\/ => A\r\n<\/pre>\n\u8a18\u8f09\u3057\u305f\u6642\u70b9\u3067(\u5b9f\u884c\u3059\u308b\u524d\u304b\u3089)\u3001\u3069\u306e\u30af\u30e9\u30b9\u3092\u8868\u3057\u3066\u3044\u308b\u306e\u304b\u304c\u660e\u767d\u3067\u3042\u308b\u3068\u3053\u308d\u306fself::<\/code>\u3068\u540c\u3058\u3067\u3059\u3002<\/p>\n\u3053\u3061\u3089\u3082\u5b9f\u306b\u89e3\u308a\u3084\u3059\u3059\u304e\u3066\u8a71\u306b\u306a\u3089\u306a\u3044\uff01<\/p>\n
static:: \u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u3063\u305f\u9045\u5ef6\u9759\u7684\u675f\u7e1b<\/h2>\n
\u307e\u305a\u3001\u3053\u306e\u300c\u9045\u5ef6\u9759\u7684\u675f\u7e1b\u300d\u3067\u3059\u304c\u30012\u3064\u306e\u5358\u8a9e\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u3067\u304d\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u9759\u7684\u675f\u7e1b (static binding) + \u9045\u5ef6\u675f\u7e1b (Late binding) = \u9045\u5ef6\u9759\u7684\u675f\u7e1b (Late Static Bindings)<\/p><\/blockquote>\n
\u524d\u9805\u3067\u306f\u3001self::<\/code>\u3082parent::<\/code>\u3082\u3001\u8a18\u8f09\u3057\u305f\u6642\u70b9\u3067(\u5b9f\u884c\u3059\u308b\u524d\u304b\u3089)\u3001\u3069\u306e\u30af\u30e9\u30b9\u3092\u8868\u3057\u3066\u3044\u308b\u306e\u304b\u304c\u660e\u767d\u3067\u3042\u308b\u3053\u3068\u3092\u8a71\u3057\u307e\u3057\u305f\u3002<\/p>\n\u304a\u5bdf\u3057\u306e\u901a\u308a\u3001static::<\/code>\u306f\u305d\u306e\u9006\u3067\u3059\u3002<\/p>\n\u3064\u307e\u308a\u3001\u8a18\u8f09\u3057\u305f\u6642\u70b9\u3067\u306f(\u5b9f\u884c\u3059\u308b\u524d\u304b\u3089\u306f)\u3001\u3069\u306e\u30af\u30e9\u30b9\u3092\u8868\u3057\u3066\u3044\u308b\u306e\u304b\u304c\u660e\u767d\u3067\u306f\u306a\u3044\u3067\u3059\u3002\u5b9f\u884c\u6642\u306b\u52d5\u7684\u306b\u89e3\u6c7a\u3055\u308c\u307e\u3059<\/strong>\u3002<\/p>\n\u3053\u308c\u3067\u300c\u9045\u5ef6<\/strong>\u9759\u7684\u675f\u7e1b\u300d\u306e\u300c\u9045\u5ef6<\/strong>\u300d\u306e\u90e8\u5206\u306e\u610f\u5473\u304c\u5206\u304b\u308a\u307e\u3057\u305f\u3088\u306d\u3002<\/p>\n\u300c\u8a55\u4fa1(static::\u306e\u89e3\u6c7a)\u3092\u5b9f\u884c\u6642\u306b\u9045\u5ef6\u3055\u305b\u308b<\/strong>\u300d\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n\u305d\u3057\u3066\u3001\u300c\u9759\u7684<\/strong>\u300d\u306e\u90e8\u5206\u306e\u610f\u5473\u306f\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306e\u539f\u6587\u3092\u518d\u5ea6\u5f15\u7528\u3057\u3066\u8aac\u660e\u3057\u307e\u3059\u3068<\/p>\n“\u9759\u7684\u675f\u7e1b (static binding)” \u306e\u7531\u6765\u306f\u3001 \u9759\u7684\u30e1\u30bd\u30c3\u30c9\u306e\u30b3\u30fc\u30eb\u306b\u4f7f\u7528\u3067\u304d\u308b\u3053\u3068\u306b\u3088\u308a\u307e\u3059 (\u305f\u3060\u3057\u3001\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u4ee5\u5916\u3067\u3082\u4f7f\u7528\u53ef\u80fd\u3067\u3059<\/p><\/blockquote>\n
\u3064\u307e\u308a\u3001static::\u9759\u7684\u30e1\u30bd\u30c3\u30c9()<\/code>\u3068\u3044\u3046\u3075\u3046\u306b\u4f7f\u3046\u3053\u3068\u304c\u591a\u3044\u3053\u3068\u306b\u56e0\u3093\u3067\u300c\u9759\u7684\u300d\u306b\u306a\u3063\u305f\u308f\u3051\u3067\u3059\u3002<\/p>\nstatic:: \u306e\u89e3\u6c7a\u30eb\u30fc\u30eb<\/h3>\n
static::<\/code>\u304c\u3069\u306e\u3088\u3046\u306b\u89e3\u6c7a\u3055\u308c\u308b\u304b\u3092\u8a71\u3059\u524d\u306b\u3001\u4e88\u5099\u77e5\u8b58\u3068\u3057\u3066\u3001<\/p>\n\n- \u975e\u8ee2\u9001\u30b3\u30fc\u30eb(non-forwarding call)<\/li>\n
- \u8ee2\u9001\u30b3\u30fc\u30eb(forwarding call)<\/li>\n<\/ul>\n
\u3068\u306f\u4f55\u304b\u3092\u77e5\u3063\u3066\u304a\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u975e\u8ee2\u9001\u30b3\u30fc\u30eb(non-forwarding call)<\/h4>\n“\u8ee2\u9001\u30b3\u30fc\u30eb” \u3068\u306f\u3001self:: \u3084 parent::\u3001static:: \u306b\u3088\u308b\u9759\u7684\u306a\u30b3\u30fc\u30eb\u3001 \u3042\u308b\u3044\u306f\u30af\u30e9\u30b9\u968e\u5c64\u306e\u4e2d\u3067\u306e forward_static_call() \u306b\u3088\u308b\u30b3\u30fc\u30eb\u306e\u3053\u3068\u3067\u3059\u3002<\/p><\/blockquote>\n
\u8ee2\u9001\u30b3\u30fc\u30eb(forwarding call)<\/h4>\n
\u30af\u30e9\u30b9\u540d::<\/code>\u306e\u5f62\u3092\u53d6\u3063\u305f\u9759\u7684\u30b3\u30fc\u30eb\u3002<\/p>\n\u8ee2\u9001\/\u975e\u8ee2\u9001 \u30b3\u30fc\u30eb \u306e\u4f8b<\/h4>\n
\u300c\u8ee2\u9001\/\u975e\u8ee2\u9001\u300d\u3068\u306f\u8a00\u3063\u3066\u3082\u3001\u76ee\u7684\u8a9e\u304c\u306a\u3044\u3068\u610f\u5473\u4e0d\u660e\u306b\u306a\u308a\u307e\u3059\u3088\u306d\u3002<\/p>\n
\u3067\u306f\u3001\u305d\u3082\u305d\u3082\u300c\u4f55\u300d\u3092\u8ee2\u9001\u3059\u308b\u306e\u304b\u3001\u6216\u3044\u306f\u3057\u306a\u3044\u304b\uff1f<\/p>\n
\u305d\u308c\u306f\u306d\u3001\u300c\u30b3\u30fc\u30eb\u5143\u306e\u30af\u30e9\u30b9\u306e\u60c5\u5831<\/strong>\u300d\u3001\u3082\u3063\u3068\u5206\u304b\u308a\u3084\u3059\u304f\u3044\u3046\u3068\u300c\u547c\u3073\u51fa\u3057\u5143\u30af\u30e9\u30b9\u306e\u540d\u524d<\/strong>\u300d\u3067\u3059\u3002<\/p>\n\u8ee2\u9001\u30b3\u30fc\u30eb\u306f\u300c\u547c\u3073\u51fa\u3057\u5143\u30af\u30e9\u30b9\u306e\u540d\u524d\u300d\u3092\u30b3\u30fc\u30eb\u3057\u3088\u3046\u3068\u3057\u3066\u3044\u308b\u30e1\u30bd\u30c3\u30c9\u306b\u4f1d\u3048\u307e\u3059\u3002<\/p>\n
\u4f8b\u3048\u3070\u3001self::foo()<\/code> \u3067\u3042\u308c\u3070\u3001\u300c\u547c\u3073\u51fa\u3057\u5143\u30af\u30e9\u30b9\u306e\u540d\u524d\u306f\u25ef\u25ef\u3067\u3059\u3088\u300d\u3068\u3001foo()<\/code>\u306b\u6559\u3048\u308b\u306e\u3067\u3059\u3002<\/p>\n\u4e00\u65b9\u3001\u975e\u8ee2\u9001\u30b3\u30fc\u30eb\u306f\u9055\u3044\u307e\u3059\u3002\u4f8b\u3048\u3070 A::foo()<\/code> \u3067\u3042\u308c\u3070\u3001\u547c\u3073\u51fa\u3057\u5143\u30af\u30e9\u30b9\u306e\u540d\u524d\u304cA<\/code>\u3067\u3042\u308b\u306e\u306f\u81ea\u660e\u3067\u3059\u304b\u3089\u3001foo()<\/code>\u306b\u308f\u3056\u308f\u3056\u6559\u3048\u308b\u5fc5\u8981\u306f\u306a\u3044\u3067\u3059\u3002\u3060\u304b\u3089\u300c\u8ee2\u9001\u300d\u3057\u306a\u304f\u3066\u3082\u5927\u4e08\u592b\u3067\u3059\u3002<\/p>\n\u3064\u307e\u308a\u3001\u300c\u30b3\u30fc\u30eb\u5143\u306e\u30af\u30e9\u30b9\u306e\u60c5\u5831<\/strong>\u300d\u306f\u975e\u8ee2\u9001\u30b3\u30fc\u30eb<\/strong>\u306b\u3088\u3063\u3066\u767a\u4fe1\u3055\u308c\u3001\u305d\u306e\u5f8c\u3001\u8ee2\u9001\u30b3\u30fc\u30eb<\/strong>\u306b\u3088\u3063\u3066\u4f1d\u9054\u3055\u308c\u3066\u3044\u304f\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n\u5177\u4f53\u6027\u306b\u6b20\u3051\u308b\u8aac\u660e\u3067\u5206\u304b\u308a\u306b\u304f\u3044\u3068\u601d\u3046\u306e\u3067\u3001\u4e0b\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u4e0b\u3055\u3044\u3002<\/p>\n
class A\r\n{\r\n public static function foo()\r\n {\r\n \/\/ static:: \u306f\u300c\u547c\u3073\u51fa\u3057\u5143\u30af\u30e9\u30b9\u300d\u306e\u30b9\u30b3\u30fc\u30d7\u3002\r\n \/\/ \u300cstatic:: \u306f\u547c\u3073\u51fa\u3057\u5143\u30af\u30e9\u30b9\u3067\u3042\u308b\u300d\u3068\u8aad\u307f\u66ff\u3048\u3066\u3082OK\u3002\r\n echo static::class . PHP_EOL;\r\n\r\n\r\n \/\/ ====== `A::foo()` \u304b\u3089\u304d\u305f\u5834\u5408 ======\r\n \/\/\r\n \/\/ \u300c\u79c1\u3092\u547c\u3093\u3060\u306e\u306fA\u3060\u300d\u3068\u81ea\u660e\u3060\u304b\u3089\u3001\u547c\u3073\u51fa\u3057\u5143\u306f\u30af\u30e9\u30b9A\u3067\u3042\u308b\u3002\r\n \/\/ \u3064\u307e\u308a\u3001static:: \u306f `A::` \u306b\u89e3\u6c7a\u3055\u308c\u308b\r\n\r\n\r\n\r\n \/\/ ====== `parent::foo()` \u304b\u3089\u304d\u305f\u5834\u5408 ======\r\n \/\/\r\n \/\/ \u300c\u547c\u3073\u51fa\u3057\u5143\u306f\u30af\u30e9\u30b9C\u3060\u300d\u3068\u3044\u3046\u4f1d\u8a00(\u60c5\u5831)\u3092\u53d7\u3051\u53d6\u3063\u305f\u306e\u3067\u3001\r\n \/\/ static:: \u306f `C::` \u306b\u89e3\u6c7a\u3055\u308c\u308b\r\n\r\n\r\n\r\n \/\/ ====== `self::foo()` \u304b\u3089\u304d\u305f\u5834\u5408 ======\r\n \/\/\r\n \/\/ \u300c\u547c\u3073\u51fa\u3057\u5143\u306f\u30af\u30e9\u30b9C\u3060\u300d\u3068\u3044\u3046\u4f1d\u8a00(\u60c5\u5831)\u3092\u53d7\u3051\u53d6\u3063\u305f\u306e\u3067\u3001\r\n \/\/ static:: \u306f `C::` \u306b\u89e3\u6c7a\u3055\u308c\u308b\r\n\r\n\r\n\r\n \/\/ ====== `static::foo()` \u304b\u3089\u304d\u305f\u5834\u5408 ======\r\n \/\/\r\n \/\/ \u300c\u547c\u3073\u51fa\u3057\u5143\u306f\u30af\u30e9\u30b9C\u3060\u300d\u3068\u3044\u3046\u4f1d\u8a00(\u60c5\u5831)\u3092\u53d7\u3051\u53d6\u3063\u305f\u306e\u3067\u3001\r\n \/\/ static:: \u306f `C::` \u306b\u89e3\u6c7a\u3055\u308c\u308b\r\n }\r\n}\r\n\r\nclass B extends A\r\n{\r\n public static function test()\r\n {\r\n \/\/ \u300c\u975e\u8ee2\u9001\u30b3\u30fc\u30eb\u300d `C::test()` \u306b\u3088\u3063\u3066\u3001\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u30b3\u30fc\u30eb\u3055\u308c\u308b\u3068\u4eee\u5b9a\u3057\u3088\u3046\r\n \/\/\r\n \/\/\r\n \/\/ \u305d\u3057\u305f\u3089\u3001\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u6b21\u306e\u60c5\u5831\u3092\u77e5\u3063\u3066\u3044\u308b\r\n \/\/ \u300c\u79c1\u3092\u30b3\u30fc\u30eb\u3057\u305f\u306e\u306f\u30af\u30e9\u30b9C\u3060\u300d --> \u300c\u547c\u3073\u51fa\u3057\u5143\u306f\u30af\u30e9\u30b9C\u3060\u300d\r\n\r\n A::foo();\r\n \/\/ \u975e\u8ee2\u9001\u30b3\u30fc\u30eb\r\n \/\/ \u300c\u547c\u3073\u51fa\u3057\u5143\u30af\u30e9\u30b9\u306f A\u300d \u3068\u3044\u3046\u60c5\u5831\u304c\u3067\u304d\u305f\u3002\r\n \/\/ \u305d\u3057\u3066\u3001foo() \u306f\u300c\u547c\u3073\u51fa\u3057\u5143\u306f\u30af\u30e9\u30b9A\u3060\u300d\u3068\u77e5\u3063\u3066\u3044\u308b\u3002\r\n \/\/ \u305f\u3060\u3057\u3001test() \u306b\u306f\u95a2\u4fc2\u306e\u306a\u3044\u60c5\u5831\u3060\u3002\r\n \/\/ test() \u306f\u3042\u304f\u307e\u3067\u3082\u300c\u79c1\u3092\u30b3\u30fc\u30eb\u3057\u305f\u306e\u306f\u30af\u30e9\u30b9C\u3060\u300d\u4ee5\u5916\u306f\u77e5\u308b\u5fc5\u8981\u306f\u306a\u3044\r\n\r\n\r\n parent::foo();\r\n \/\/ \u8ee2\u9001\u30b3\u30fc\u30eb\r\n \/\/ \u300c\u547c\u3073\u51fa\u3057\u5143\u306f\u30af\u30e9\u30b9C\u3060\u300d\u3068\u3044\u3046\u3053\u3068(\u60c5\u5831)\u3092 foo() \u306b\u4f1d\u3048\u308b\r\n\r\n\r\n self::foo();\r\n \/\/ \u8ee2\u9001\u30b3\u30fc\u30eb\r\n \/\/ \u300c\u547c\u3073\u51fa\u3057\u5143\u306f\u30af\u30e9\u30b9C\u3060\u300d\u3068\u3044\u3046\u3053\u3068(\u60c5\u5831)\u3092 foo() \u306b\u4f1d\u3048\u308b\r\n\r\n\r\n static::foo();\r\n \/\/ \u8ee2\u9001\u30b3\u30fc\u30eb\r\n \/\/ \u300c\u547c\u3073\u51fa\u3057\u5143\u306f\u30af\u30e9\u30b9C\u3060\u300d\u3068\u3044\u3046\u3053\u3068(\u60c5\u5831)\u3092 foo() \u306b\u4f1d\u3048\u308b\r\n }\r\n}\r\n\r\nclass C extends B\r\n{\r\n}\r\n\r\n\r\nC::test();\r\n\/\/ \u975e\u8ee2\u9001\u30b3\u30fc\u30eb\r\n\/\/ \u300c\u547c\u3073\u51fa\u3057\u5143\u30af\u30e9\u30b9\u306f C\u300d \u3068\u3044\u3046\u60c5\u5831\u304c\u3067\u304d\u305f\u3002\r\n\/\/ \u305d\u3057\u3066\u3001test() \u306f\u300c\u547c\u3073\u51fa\u3057\u5143\u306f\u30af\u30e9\u30b9A\u3060\u300d\u3068\u77e5\u3063\u3066\u3044\u308b\u3002\r\n\r\n\r\n\r\n\r\n\/\/ \u5b9f\u884c\u7d50\u679c\r\n\/\/\r\n\/\/ A\r\n\/\/ C\r\n\/\/ C\r\n\/\/ C<\/pre>\n\u3053\u308c\u3067\u300c\u9045\u5ef6\u9759\u7684\u675f\u7e1b\u300d\u306e\u6b63\u4f53\u304c\u5206\u304b\u3063\u3066\u3082\u3089\u3048\u305f\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n
\u3061\u306a\u307f\u306b\u3001 forward_static_call <\/a>\u3092\u4f7f\u3048\u3070\u3001\u9045\u5ef6\u9759\u7684\u675f\u7e1b\u3092\u4f7f\u3063\u305f\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u306e\u30b3\u30fc\u30eb\u304c\u3067\u304d\u307e\u3059\u3002\u4f7f\u3044\u9053\u306f\u3044\u307e\u3044\u3061\u601d\u3044\u3064\u304b\u306a\u3044\u3067\u3059\u304c\u2026<\/p>\n\u305d\u308c\u3068\u3001\u4f8b\u306e\u4e2d\u306estatic::class<\/code>\u306e::class<\/code>\u3068\u3044\u3046\u8a18\u8ff0\u6cd5\u306fPHP 5.5\u4ee5\u964d\u306e\u6a5f\u80fd\u3067\u3059\u3002\u304a\u4f7f\u3044\u306ePHP\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u304c\u53e4\u3044\u306e\u306a\u3089\u3001static::class<\/code>\u3092 get_called_class() <\/a>\u306b\u7f6e\u304d\u63db\u3048\u3066\u4e0b\u3055\u3044\u3002<\/p>\n\u9045\u5ef6\u9759\u7684\u675f\u7e1b\u306e\u4f7f\u3044\u9053<\/h2>\n
PHP 5.3.0\u4ee5\u524d\u3067\u306fself<\/code>\u3057\u304b\u4f7f\u3048\u306a\u304b\u3063\u305f\u306e\u3067\u3001\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u3092\u7d99\u627f\u3057\u305f\u969b\u306b\u4e0d\u90fd\u5408\u306a\u3053\u3068\u304c\u304a\u304d\u307e\u3059<\/strong>\u3002<\/p>\nself<\/code>\u3092\u4f7f\u3063\u305f(\u30c0\u30e1\u306a)\u7d99\u627f\u4f8b:<\/p>\nclass Employee\r\n{\r\n static protected $department = 'General';\r\n\r\n public static function getDepartment()\r\n {\r\n return self::$department . PHP_EOL;\r\n }\r\n}\r\n\r\nclass WebDesigner extends Employee\r\n{\r\n static protected $department = 'Web Design';\r\n}\r\n\r\nclass Developer extends Employee\r\n{\r\n static protected $department = 'Software Development';\r\n}\r\n\r\n\r\necho WebDesigner::getDepartment(); \/\/ => 'General' \u672c\u5f53\u306f'Web Design'\u3067\u3042\u3063\u3066\u307b\u3057\u3044\r\necho Developer::getDepartment(); \/\/ => 'General' \u672c\u5f53\u306f'Software Development'\u3067\u3042\u3063\u3066\u307b\u3057\u3044<\/pre>\nself::<\/code> \u3092 static::<\/code>\u306b\u7f6e\u304d\u63db\u3048\u308b\u3068\u671f\u5f85\u901a\u308a\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u3092\u7d99\u627f\u3057\u305f\u6642\u306b\u3001static::<\/code>\u3092\u4f7f\u3048\u3070\u7d99\u627f\u5148\u306e\u30af\u30e9\u30b9\u3092\u8868\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u67d4\u8edf\u6027\u304c\u5897\u3059\u3002\u4f7f\u3044\u9053\u306f\u3053\u3053\u3067\u3059\u3002<\/p>\n\u4ee5\u4e0b\u306e\u8a18\u4e8b\u306b\u306f\u5b9f\u7528\u4f8b\u304c\u8c4a\u5bcc\u306b\u8f09\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u3068\u3066\u3082\u53c2\u8003\u306b\u306a\u308a\u307e\u3059\u3002
\nPHP V5.3 \u3067\u9045\u5ef6\u9759\u7684\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u3092\u4f7f\u3063\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u6d3b\u7528\u3059\u308b<\/a><\/p>\n`$this->` \u3068 `static::` \u306e\u76f8\u9055\u70b9<\/h2>\n
\u300c\u547c\u3073\u51fa\u3057\u5143\u3092\u8868\u3059\u30ad\u30fc\u30ef\u30fc\u30c9\u300d\u3068\u3044\u3046\u89b3\u70b9\u304b\u3089\u898b\u308c\u3070\u3001static::<\/code> \u3068 $this-><\/code> \u306f\u3088\u304f\u4f3c\u3066\u3044\u307e\u3059\u3002static::<\/code>\u306f\u547c\u3073\u51fa\u3057\u5143\u30af\u30e9\u30b9\u3001$this-><\/code>\u306f\u547c\u3073\u51fa\u3057\u5143\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u8868\u3057\u307e\u3059\u3002<\/p>\n\u3057\u304b\u3057\u3001\u9055\u3046\u70b9\u3082\u591a\u3044\u3067\u3059\u3002\u4e92\u63db\u6027\u304c\u3042\u3063\u305f\u308a\u306a\u304b\u3063\u305f\u308a\u3059\u308b\u306e\u3067\u3001\u6ce8\u610f\u3059\u3079\u3057\uff01<\/p>\n
\u5229\u7528\u3067\u304d\u308b\u7bc4\u56f2<\/h3>\n
$this-><\/code>\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u5185<\/strong>\u3067\u3057\u304b\u5229\u7528\u3067\u304d\u306a\u3044\u3002<\/p>\nstatic::<\/code>\u306f\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u5185\u3067\u3082\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u5185\u3067\u3082\u5229\u7528\u3067\u304d\u308b<\/strong>\u304c\u3001\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u5185\u3067\u5229\u7528\u3059\u308b\u30b1\u30fc\u30b9\u304c\u591a\u3044\u3002<\/p>\n\u8868\u3059\u547c\u3073\u51fa\u3057\u5143\u304c\u5909\u5316\u3059\u308b\u304b<\/h3>\n
$this-><\/code>\u306e\u5834\u5408\u300c\u8ee2\u9001\/\u975e\u8ee2\u9001\u30b3\u30fc\u30eb\u300d\u306e\u6982\u5ff5\u304c\u306a\u3044\u306e\u3067\u3001$this<\/code>\u304c\u6307\u3059\u547c\u3073\u51fa\u3057\u5143\u306f\u6700\u521d\u304b\u3089\u6700\u5f8c\u307e\u3067\u305a\u3063\u3068\u5909\u308f\u3089\u306a\u3044\u3002<\/p>\nstatic::<\/code>\u306e\u5834\u5408\u3001\u975e\u8ee2\u9001\u30b3\u30fc\u30eb\u306b\u3088\u3063\u3066\u3001\u547c\u3073\u51fa\u3057\u5143\u304c\u3053\u308d\u3053\u308d\u5909\u308f\u308b\u3053\u3068\u304c\u3042\u308b\u3002<\/p>\n\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u53c2\u7167<\/h3>\n
$this-><\/code>\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3001static::<\/code>\u306f\u30af\u30e9\u30b9\u5909\u6570\u3057\u304b\u53c2\u7167\u3067\u304d\u306a\u3044\u3002<\/p>\nprivate \u306a \u30d7\u30ed\u30d1\u30c6\u30a3\/\u30e1\u30bd\u30c3\u30c9 \u3078\u306e\u30a2\u30af\u30bb\u30b9\u306e\u6319\u52d5<\/h3>\n
private \u306a \u30d7\u30ed\u30d1\u30c6\u30a3\/\u30e1\u30bd\u30c3\u30c9 \u3078\u306e\u30a2\u30af\u30bb\u30b9\u306e\u6319\u52d5\u306b\u95a2\u3057\u3066\u306f\u3001static::<\/code>\u3068$this-><\/code>\u3067\u306f\u304b\u306a\u308a\u7570\u306a\u308b\u306e\u3067\u3001\u8981\u6ce8\u610f\u3067\u3059\uff01<\/p>\n\u3084\u3084\u3053\u3057\u3044\u306e\u3067\u3001\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n
private \u306a \u30d7\u30ed\u30d1\u30c6\u30a3 \u3078\u306e\u30a2\u30af\u30bb\u30b9\u306e\u6319\u52d5<\/h4>\n<?php\r\n\r\nini_set('display_errors', 1);\r\n\r\nclass A\r\n{\r\n static private $private_var = 'private var in A';\r\n static protected $protected_var = 'protected var in A';\r\n\r\n protected static function bar()\r\n {\r\n echo 'static:: is class ' . static::class . PHP_EOL;\r\n \/\/ => static:: is class B\r\n \/\/\r\n \/\/ static:: \u306f\u30af\u30e9\u30b9B\u3092\u8868\u3057\u3066\u3044\u308b\r\n\r\n\r\n echo static::$protected_var . PHP_EOL;\r\n \/\/ => protected var in A\r\n \/\/\r\n \/\/ B::$protected_var \u3060\u3068\u8003\u3048\u308c\u3070\u5f53\u7136\u306e\u7d50\u679c\u3002\r\n\r\n\r\n echo static::$private_var . PHP_EOL;\r\n \/\/ => Fatal error: Cannot access private property B::$private_var\r\n \/\/\r\n \/\/ B::$private_var \u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u3002\r\n \/\/ B::$private_var \u306f\u3061\u3083\u3093\u3068\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u306e\u306b\u3001\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044!?\r\n \/\/ \u7406\u7531\u306f\u3001\u5b9f\u884c\u6642\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u304c `B` \u3067\u306f\u306a\u304f\u3001`A` \u3060\u304b\u3089\u3060\u3002\r\n \/\/ \u8a00\u3063\u3066\u307f\u308c\u3070 `B` \u306e\u5916(`A`)\u304b\u3089\u306f `B` \u306e private \u306a\u9759\u7684\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u3068\u3044\u3046\u3053\u3068\u3060\u3002\r\n \/\/\r\n \/\/ \u3068\u3053\u308d\u304c\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u3067 `$this->` \u3092\u4f7f\u3063\u3066private \u306a\u30e1\u30f3\u30d0\u30fc\u3092\u30a2\u30af\u30bb\u30b9\u3059\u308b\u5834\u5408\u3001\r\n \/\/ \u9006\u306b\u5b9f\u884c\u6642\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u5185\u306e private \u306a\u30e1\u30f3\u30d0\u30fc\u3092\u512a\u5148\u3057\u3066\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3057\u307e\u3059\u3002\r\n \/\/ \u305d\u308c\u306b\u5bfe\u3057\u3066\u3001\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u306e\u5834\u5408\u306f\u3001\u5b9a\u7fa9\u3057\u305f\u30af\u30e9\u30b9\u5185\u306e private \u306a\u30e1\u30f3\u30d0\u30fc\u3092\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3059\u308b\u3002\u3060\u304b\u3089\u30a8\u30e9\u30fc\u304c\u8d77\u304d\u308b\u3002\r\n \/\/\r\n \/\/ \u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u306e\u6319\u52d5\u306e\u307b\u3046\u304c\u81ea\u7136\u306b\u601d\u3048\u307e\u3059\u304c\u3001\u6319\u52d5\u304c\u7d71\u4e00\u3057\u3066\u306a\u304f\u3066\u3001\u6c17\u3092\u3064\u3051\u306a\u3044\u3068\u3059\u3050\u6df7\u4e71\u3057\u305d\u3046\u3067\u3059...\r\n \/\/\r\n \/\/ \u3064\u307e\u308a\u3001private \u306a\u9759\u7684\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u3001\u305d\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u5b9a\u7fa9\u3057\u305f\u30af\u30e9\u30b9\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u304b\u3089\u3067\u306a\u3044\u3068\u3001\u7d76\u5bfe\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u3002\r\n \/\/ \u3086\u3048\u306b\u3001private \u306a\u9759\u7684\u30d7\u30ed\u30d1\u30c6\u30a3\u3078\u306e\u30a2\u30af\u30bb\u30b9\u306f\u5e38\u306b self:: \u3092\u4f7f\u3046\u3079\u3057\u3002\u3053\u308c\u3001\u5927\u4e8b\u3002\r\n }\r\n}\r\n\r\nclass B extends A\r\n{\r\n static private $private_var = 'private var in B';\r\n\r\n public static function foo()\r\n {\r\n static::bar();\r\n }\r\n}\r\n\r\n\r\nB::foo();\r\n\r\n\r\n\/\/ \u5b9f\u884c\u7d50\u679c\r\n\/\/\r\n\/\/ static:: is class B\r\n\/\/ protected var in A\r\n\/\/ Fatal error: Cannot access private property B::$private_var<\/pre>\n\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u8aad\u3093\u3067\u3082\u30d4\u30f3\u3068\u3053\u306a\u3044\u4eba\u306f\u305f\u3076\u3093$this->private\u306a\u30e1\u30bd\u30c3\u30c9()<\/code>\u306e\u6319\u52d5\u306b\u5bfe\u3059\u308b\u7406\u89e3\u304c\u8db3\u308a\u306a\u3044\u3068\u601d\u308f\u308c\u308b\u306e\u3067\u3001\u5148\u306b\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3092\u3054\u89a7\u4e0b\u3055\u3044\u3002<\/p>\nPHP\u306e\u30a2\u30af\u30bb\u30b9\u6a29\u30ad\u30fc\u30ef\u30fc\u30c9 `private` \u3068\u7591\u4f3c\u5909\u6570 `$this` \u306e\u843d\u3068\u3057\u7a74<\/a><\/p>\nprivate \u306a \u30d7\u30ed\u30d1\u30c6\u30a3 \u3078\u306e\u30a2\u30af\u30bb\u30b9\u306e\u6319\u52d5<\/h4>\n
\u4e00\u898b\u843d\u7740\u306e\u3088\u3046\u306b\u898b\u3048\u307e\u3057\u305f\u304c\u3001\u306a\u3093\u3068\uff01\u300cprivate \u306a \u30d7\u30ed\u30d1\u30c6\u30a3\u300d\u3068\u306a\u308b\u3068\u3001\u307e\u305f\u6319\u52d5\u304c\u5909\u308f\u308b\u3084\u3067\u2026\uff01 \u306a\u305c\u3053\u3093\u306a\u4ed5\u69d8\u306b\u306a\u3063\u305f\u3093\u3060\u308d\u3046\u2026<\/p>\n
ini_set('display_errors', 1);\r\n\r\nclass A\r\n{\r\n protected static function bar()\r\n {\r\n static::baz();\r\n \/\/ => 'baz() in A'\r\n \/\/\r\n \/\/ `B::baz()` \u306b\u76f8\u5f53\u3059\u308b\r\n \/\/ B \u306b\u306f baz() \u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u304c\u3001A \u306e baz() \u3092\u7d99\u627f\u3057\u305f\u3002\r\n \/\/ \u7d99\u627f\u3057\u305f\u3051\u3069\u3001A \u306e \u30b3\u30f3\u30c6\u30ad\u30b9\u30c8 \u304b\u3089\u3057\u304b\u30b3\u30fc\u30eb\u3067\u304d\u306a\u3044\u3002\r\n \/\/ \u3053\u3053\u306f A \u306e \u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3060\u304b\u3089\u3001\u554f\u984c\u306a\u304f\u30b3\u30fc\u30eb\u3067\u304d\u305f\u3002\r\n\r\n\r\n static::foobar();\r\n \/\/ => Fatal error: Call to private method B::foobar() from context 'A'\r\n \/\/\r\n \/\/ `B::foobar()` \u306b\u76f8\u5f53\u3059\u308b\r\n \/\/ B \u306b\u306f foobar \u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u3066\u3001\u305d\u3057\u3066\u3001B \u306e \u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u304b\u3089\u3057\u304b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u3002\r\n \/\/ \u3053\u3053\u306f A \u306e \u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3060\u304b\u3089\u3001\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u30a8\u30e9\u30fc\u304c\u304a\u304d\u308b\u3002\r\n }\r\n\r\n private static function baz()\r\n {\r\n echo \"baz() in A\" . PHP_EOL;\r\n }\r\n\r\n private static function foobar()\r\n {\r\n echo \"foobar() in A\" . PHP_EOL;\r\n }\r\n}\r\n\r\nclass B extends A\r\n{\r\n\r\n public static function foo()\r\n {\r\n static::bar();\r\n }\r\n\r\n\r\n \/\/ private static function baz();\r\n \/\/\r\n \/\/ A::baz() \u304c B \u306b\u30b3\u30d4\u30fc\u3055\u308c\u308b\u304c\u3001\r\n \/\/ A \u306e \u30b3\u30f3\u30c6\u30ad\u30b9\u30c8 \u304b\u3089\u3057\u304b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\r\n \/\/ \u3064\u307e\u308a\u3001B \u306e\u4e2d\u3067 B::baz() \u306f\u30c0\u30e1\u3060\u304c\u3001\r\n \/\/ A \u306e \u4e2d\u3067 B::baz() \u306fOK\u3002\r\n\r\n\r\n private static function foobar()\r\n {\r\n \/\/ A::foobar() \u3092\u4e0a\u66f8\u304d\u3057\u305f\u306e\u3067\u3001\u65b0\u3057\u3044\u30e1\u30bd\u30c3\u30c9\u306e\u30b9\u30b3\u30fc\u30d7\u306f B \u3068\u306a\u308b\r\n }\r\n}\r\n\r\n\r\nB::foo();\r\n\r\n\r\n\/\/ \u5b9f\u884c\u7d50\u679c\r\n\/\/\r\n\/\/ baz() in A\r\n\/\/ Fatal error: Call to private method B::foobar() from context 'A'<\/pre>\n\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3067\u306f\u3001\u3053\u306e\u3088\u3046\u306b\u8aac\u660e\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u9759\u7684\u3067\u306a\u3044\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3067\u306f\u3001\u547c\u3073\u51fa\u3055\u308c\u308b\u30af\u30e9\u30b9\u306f\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30af\u30e9\u30b9\u3068\u540c\u3058\u306b\u306a\u308a\u307e\u3059\u3002 $this-> \u306f private \u30e1\u30bd\u30c3\u30c9\u3092\u540c\u3058\u30b9\u30b3\u30fc\u30d7\u304b\u3089\u30b3\u30fc\u30eb\u3057\u3088\u3046\u3068\u3059\u308b\u306e\u3067\u3001 static:: \u3092\u4f7f\u3046\u3068\u7570\u306a\u308b\u7d50\u679c\u3068\u306a\u308a\u307e\u3059\u3002\u3082\u3046\u3072\u3068\u3064\u306e\u76f8\u9055\u70b9\u306f\u3001 static:: \u306f\u9759\u7684\u306a\u30d7\u30ed\u30d1\u30c6\u30a3\u3057\u304b\u53c2\u7167\u3067\u304d\u306a\u3044\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p><\/blockquote>\n
$this->private\u30e1\u30bd\u30c3\u30c9()<\/code>\u306f\u3001\u5e38\u306b\u5b9f\u884c\u6642\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u5185\u306eprivate<\/code>\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u53c2\u7167\u3059\u308b\u306e\u306b\u5bfe\u3057\u3066\u3001static::private\u30e1\u30bd\u30c3\u30c9()<\/code>\u306fprivate\u30e1\u30bd\u30c3\u30c9()<\/code>\u3092\u5b9a\u7fa9\u3057\u305f\u30af\u30e9\u30b9\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u304b\u3089\u3057\u304b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044(public<\/code>\u3084protected<\/code>\u306a\u30e1\u30bd\u30c3\u30c9\u306a\u3089\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b)\u3002<\/p>\n\u3044\u3084\u306f\u3084\u2026 \u3053\u306e\u4ed5\u69d8\u306f\u3069\u3046\u306a\u306e\u3088(\u7b11) PHP 8\u306b\u4e5e\u3046\u3054\u671f\u5f85\u3063\u3066\u611f\u3058\u3067\u3059\u3002<\/p>\n
\u4f59\u8ac7\u3001`->` \u3068 `::` \u306b\u306f\u4e92\u63db\u6027\u304c\u3042\u308b\uff1f<\/h2>\n
\u4eca\u56de\u3044\u308d\u3044\u308d\u30ea\u30b5\u30fc\u30c1\u3057\u3066\u305f\u3089\u59cb\u3081\u3066\u77e5\u3063\u305f\u306e\u3067\u3059\u304c\u3001\u3069\u3046\u3084\u3089 \u77e2\u5370\u6f14\u7b97\u5b50 -><\/code> \u3068 \u30b9\u30b3\u30fc\u30d7\u5b9a\u7fa9\u6f14\u7b97\u5b50 (::)<\/code> \u306f\u4e92\u63db\u53ef\u80fd\u3089\u3057\u3044\u3002<\/p>\n\u305f\u3060\u3057\u3001\u300c\u30af\u30e9\u30b9\u306e\u4e2d\u300d\u3068\u300c\u30e1\u30bd\u30c3\u30c9\u306e\u53c2\u7167\u300d\u3068\u3046\u6761\u4ef6\u4ed8\u304d\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u3054\u89a7\u3042\u308c\u30fc<\/p>\n
ini_set('display_errors', 1);\r\n\r\nclass A\r\n{\r\n public $baz = 'baz';\r\n public static $qux = 'qux';\r\n\r\n public static function foobar()\r\n {\r\n echo 'foobar' . PHP_EOL;\r\n }\r\n\r\n public function foo()\r\n {\r\n echo 'foo' . PHP_EOL;\r\n return $this;\r\n }\r\n\r\n public function bar()\r\n {\r\n $this::foo()->foo()::foo();\r\n $this::foobar();\r\n\r\n $this->foo()::foo();\r\n $this->foobar();\r\n }\r\n}\r\n\r\n$a = new A();\r\n$a->bar();\r\n\r\n\r\n\/\/ \u5b9f\u884c\u7d50\u679c\r\n\/\/\r\n\/\/ foo\r\n\/\/ foo\r\n\/\/ foo\r\n\/\/ foobar\r\n\/\/ foo\r\n\/\/ foo\r\n\/\/ foobar<\/pre>\n\u306a\u301c\u3093\u3058\u3083\u3042\u3053\u308a\u3083\u30fc\uff01\uff1f<\/p>\n
\u306a\u3093\u3068\u3044\u3046\u30ab\u30aa\u30b9\u2026!! \u3053\u308c\u4ee5\u4e0a\u306f\u304a\u3084\u3081\u306b\u306a\u3063\u3066\u2026<\/p>\n
\u307e\u3068\u3081<\/h2>\n\n- \u300c\u9045\u5ef6\u9759\u7684\u675f\u7e1b\u300d\u6a5f\u80fd\u306e\u6838\u306f\u3001
static<\/code>\u3092\u300c\u9045\u5ef6\u8a55\u4fa1\u300d\u3059\u308b\u3068\u3053\u308d\u306b\u3042\u308b\u3002<\/li>\nstatic<\/code>\u306f\u300c\u547c\u3073\u51fa\u3057\u5143\u30af\u30e9\u30b9\u300d\u306b\u89e3\u6c7a\u3055\u308c\u308b\u3002<\/li>\n- \u547c\u3073\u51fa\u3057\u5143\u30af\u30e9\u30b9\u304c\u5909\u308f\u308b\u3068\u3001
static<\/code>\u304c\u8868\u3059\u30af\u30e9\u30b9\u3082\u9055\u3063\u3066\u304f\u308b\u3053\u3068\u306b\u6ce8\u610f\u3092\u6255\u3046\u3079\u304d\u3002<\/li>\n$this-><\/code> \u3068 static::<\/code> \u306f\u4f3c\u3066\u3044\u308b\u304c\u3001\u4e92\u63db\u6027\u3082\u306a\u3051\u308c\u3070\u3001\u76f8\u9055\u70b9\u3082\u591a\u3044\u3002<\/li>\n- \u300c\u9045\u5ef6\u9759\u7684\u675f\u7e1b\u300d\u306e\u4e3b\u306a\u4f7f\u3044\u9053\u306f\u300c\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u3092\u7d99\u627f\u3057\u305f\u969b\u306e\u52d5\u7684\u306a\u89e3\u6c7a(= \u67d4\u8edf\u6027\u304c\u9ad8\u3044)\u300d\u3002<\/li>\n<\/ul>\n
\u53c2\u8003\u8a18\u4e8b<\/h4>\n\n- PHP\u3092\u611b\u3059\u308b\u8a66\u307f \u301cself:: parent:: static:: \u304a\u3088\u3073\u9045\u5ef6\u9759\u7684\u675f\u7e1b\u301c<\/a><\/li>\n
- \u9045\u5ef6\u9759\u7684\u675f\u7e1b\u306f\u4f55\u304c\u5b09\u3057\u3044\u306e\u304b<\/a><\/li>\n
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