PHP\u306e\u30a2\u30af\u30bb\u30b9\u6a29\u30ad\u30fc\u30ef\u30fc\u30c9 \u00a0private<\/code>\u00a0\u3068\u7591\u4f3c\u5909\u6570 $this<\/code>\u3001\u3069\u3061\u3089\u3082\u79c1\u304c\u521d\u5fc3\u8005\u306e\u9803\u304b\u3089\u6163\u308c\u89aa\u3057\u3093\u3067\u304d\u305f\u30ef\u30fc\u30c9\u3060\u3057\u3001\u65e5\u5e38\u7684\u306b\u3082\u304a\u4e16\u8a71\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3059\u3002<\/p>\n

\u304a\u6065\u305a\u304b\u3057\u3044\u8a71\u3067\u3059\u304c\u3001\u3064\u3044\u6700\u8fd1\u307e\u3067\u306f\u5b9f\u306f\u5206\u304b\u308b\u3088\u3046\u3067\u5206\u304b\u3089\u306a\u3044\u3067\u3044\u305f\u306e\u3067\u3059\u2026\uff01<\/p>\n

\u4f55\u304c\u3088\u304f\u5206\u304b\u3063\u3066\u306a\u304b\u3063\u305f\u304b\u3068\u3044\u3046\u3068\u3067\u3059\u306d\u3001\u30af\u30e9\u30b9\u3092\u7d99\u627f\u3057\u305f\u6642\u306b\u3001\u7d99\u627f\u3057\u305f\u30e1\u30bd\u30c3\u30c9( public | protected )\u306e\u4e2d\u306e$this<\/code>\u304c\u6307\u3059\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u7d99\u627f\u5143\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306a\u306e\u304b\u3001\u305d\u308c\u3068\u3082\u7d99\u627f\u5148\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306a\u306e\u304b<\/strong>\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n

\u305d\u3057\u3066\u3001\u7d99\u627f\u3067\u304d\u308b\u306f\u305a\u3082\u306a\u3044private<\/code>\u306a\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u7d99\u627f\u3057\u305f\u30e1\u30bd\u30c3\u30c9\u7d4c\u7531\u3067\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u8fba\u308a\u3082\u306a\u3093\u3060\u304b\u4e0d\u601d\u8b70\u3067\u306a\u3089\u306a\u3044\u3067\u3059\u3002<\/p>\n

\u305d\u308d\u305d\u308d\u30b9\u30c3\u30ad\u30ea\u3055\u305b\u305f\u3044\u306a\u3068\u601d\u3044\u307e\u3057\u305f\u2026\uff01<\/p>\n

\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u8aad\u307f\u6f01\u3063\u3066\u3082\u8a73\u3057\u3044\u8aac\u660e\u304c\u8f09\u3063\u3066\u306a\u304b\u3063\u305f\u306e\u3067\u3001\u81ea\u5206\u3067\u5b9f\u9a13\u3057\u3066\u307f\u3066\u5206\u304b\u3063\u305f\u3053\u3068\u3092\u307e\u3068\u3081\u3066\u304a\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002\u79c1\u3068\u540c\u3058\u304f\u3053\u3053\u3089\u3078\u3093\u3067\u9055\u548c\u611f\u3092\u899a\u3048\u3066\u3044\u308b\u4eba\u305f\u3061\u306e\u3054\u53c2\u8003\u306b\u306a\u308c\u3070\u5b09\u3057\u3044\u3067\u3059\u3002<\/p>\n

$this \u304c\u6307\u3059\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u3064\u3044\u3066<\/h2>\n

class A\r\n{\r\n    protected function foo($b)\r\n    {\r\n        echo ($b === $this ? '$b  IS  $this' : '$b  IS NOT  $this') . \"  (in A)\" . PHP_EOL;\r\n\r\n        $class_of_this = get_class($this);\r\n        echo \"Calling private method in class === A ===. `\\$this` is a instance of class === $class_of_this ===\" . PHP_EOL;\r\n    }\r\n}\r\n\r\nclass B extends A\r\n{\r\n    public function bar($b)\r\n    {\r\n        echo ($b === $this ? '$b  IS  $this' : '$b  IS NOT  $this') . \"  (in B)\" . PHP_EOL;\r\n\r\n        $this->foo($b); \/\/ \u30af\u30e9\u30b9 `A` \u304b\u3089\u7d99\u627f\u3057\u3066\u304d\u305f\u30e1\u30bd\u30c3\u30c9 `foo` \u3092\u30b3\u30fc\u30eb\u3059\u308b\r\n    }\r\n}\r\n\r\n\r\n$b = new B;\r\n$b->bar($b); \/\/ \u81ea\u5206\u81ea\u8eab\u3092 B::bar \u306b\u6e21\u3059\r\n\r\n\r\n\/\/ \u7d50\u679c:\r\n\/\/\r\n\/\/ $b  IS  $this  (in B)\r\n\/\/ $b  IS  $this  (in A)\r\n\/\/ Calling private method in class === A ===. `$this` is a instance of class === B ===<\/pre>\n
\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b\u3082\u3042\u308b\u3088\u3046\u306b\u300c$this<\/em> \u306f\u547c\u3073\u51fa\u3057\u5143\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3078\u306e\u53c2\u7167\u3067\u3042\u308b<\/strong>\u300d\u3002
\nB::bar<\/code>\u00a0\u306e\u4e2d\u306e $this<\/code>\u00a0\u306f\u3001\u547c\u3073\u51fa\u3057\u5143\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3042\u308b \u300c\u30af\u30e9\u30b9\u306e\u5916\u306e $b\u300d\u3078\u306e\u53c2\u7167\u3002
\nA::foo<\/code>\u00a0\u306e\u4e2d\u306e $this<\/code>\u00a0\u306f\u3001\u547c\u3073\u51fa\u3057\u5143\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3042\u308b\u300c\u30af\u30e9\u30b9B\u306e\u4e2d\u306e $this\u300d\u3078\u306e\u53c2\u7167\u3002
\n\u3064\u307e\u308a B::bar<\/code>\u00a0\u306e\u4e2d\u306e $this<\/code>\u00a0\u3082\u3001A::foo<\/code>\u00a0\u306e\u4e2d\u306e $this<\/code>\u00a0\u3082\u3001\u5916\u5074\u306e $b<\/code>\u00a0\u3067\u3042\u308b(\u3078\u306e\u53c2\u7167)\u3053\u3068\u304c\u5206\u304b\u308b\u3002<\/p>\n
\u3082\u3063\u3068\u8a00\u3048\u3070\u3001\u30af\u30e9\u30b9\u306e\u7d99\u627f\u304c\u3069\u3093\u306a\u306b\u6df1\u304f\u3066\u3082\u3001$this<\/code> \u306f\u5e38\u306b\u6700\u521d(\u30eb\u30fc\u30c8)\u306e\u547c\u3073\u51fa\u3057\u5143\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3042\u308b\u3002<\/p>\n
\u843d\u3068\u3057\u7a74<\/strong>\uff1a\u30af\u30e9\u30b9A\u306e\u4e2d\u306e $this<\/code> \u3068\u30af\u30e9\u30b9B\u306e\u4e2d\u306e $this<\/code> \u304c\u9055\u3046\u3082\u306e\u3060\u3068\u8003\u3048\u308b\u3002<\/p>\n
\u6b63\u89e3\uff1a<\/strong>\u30af\u30e9\u30b9A\u306e\u4e2d\u306e $this<\/code> \u3068\u30af\u30e9\u30b9B\u306e\u4e2d\u306e $this<\/code> \u304c\u540c\u4e00\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8(\u30af\u30e9\u30b9B\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9)\u3067\u3042\u308b\u3002<\/p>\n
\u57fa\u672c\u7684$this<\/code>\u304c\u8868\u3059\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u7d42\u59cb\u5909\u5316\u3057\u306a\u3044\u3068\u8003\u3048\u3066\u554f\u984c\u306a\u3044\u306e\u3067\u3059\u304c\u3001\u4f8b\u5916\u3082\u3042\u308b\u3002<\/p>\n
$this \u306f\u3001\u547c\u3073\u51fa\u3057\u5143\u30aa\u30d6\u30b8\u30a7\u30af\u30c8 (\u901a\u5e38\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u304c\u5c5e\u3059\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u304c\u3001 \u30e1\u30bd\u30c3\u30c9\u304c\u7b2c\u4e8c\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e \u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u304b\u3089 \u30b9\u30bf\u30c6\u30a3\u30c3\u30af\u306b \u30b3\u30fc\u30eb\u3055\u308c\u308b\u5834\u5408\u306b\u306f\u3001\u5225\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u306a\u308b\u5834\u5408\u3082\u3042\u308a\u307e\u3059) \u3078\u306e\u53c2\u7167\u3067\u3059\u3002<\/p><\/blockquote>\n
\u305d\u3082\u305d\u3082\u305d\u3046\u3044\u3046\u4f7f\u3044\u65b9\u306f\u975e\u63a8\u5968\u3060\u3057\u3001\u5c06\u6765\u7684\u306b\u5ec3\u6b62\u3059\u308b\u4e88\u5b9a\u306a\u306e\u3067\u3001\u7121\u8996\u3057\u3066\u3044\u3044\u30ec\u30d9\u30eb\u3067\u3059\u304c\u306a\u3002<\/p>\n
private\u306a\u30e1\u30f3\u30d0\u30fc\u3068\u5b9f\u884c\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306e\u95a2\u4fc2<\/h2>\n
<?php\r\n\r\nini_set('display_errors', 1);\r\n\r\n\r\nabstract class A\r\n{\r\n    private $private_var = 'private var in A';\r\n    private $private_var_that_only_A_has = 'private var that only A has';\r\n    protected $protected_var = 'protected var in A';\r\n    protected $protected_var_to_be_inherited = 'protected var to be inherited from A';\r\n\r\n\r\n    protected function foo()\r\n    {\r\n\r\n        global $b;\r\n        if ($b instanceof B AND $b === $this) {\r\n            echo '$b is a instance of B, and $b identical to $this' . PHP_EOL;\r\n        } else {\r\n            return;\r\n        }\r\n\r\n\r\n        \/\/ \u3053\u3053\u304b\u3089\u5148\u306f\u3001`$this === $b` \u3068\u3044\u3046\u524d\u63d0\u3067\u8a71\u304c\u9032\u3080 (\u3064\u307e\u308a\u3001\"\u547c\u3073\u51fa\u3057\u5143\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\"\u304c \u30af\u30e9\u30b9B\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3042\u308b`$b`)\r\n\r\n        echo $this->protected_var . PHP_EOL;\r\n        \/\/ => 'protected var in B'\r\n        \/\/\r\n        \/\/ $b->protected_var  \u3060\u3068\u8003\u3048\u308c\u3070\u7d0d\u5f97\u3060\u3088\u306d\uff01\r\n\r\n\r\n        echo $this->protected_var_to_be_inherited . PHP_EOL;\r\n        \/\/ => 'protected var to be inherited from A'\r\n        \/\/\r\n        \/\/ $b->protected_var_to_be_inherited  \u3060\u3068\u8003\u3048\u308c\u3070\u7d0d\u5f97\u3060\u3088\u306d\uff01\r\n        \/\/ B::protected_var_to_be_inherited \u306a\u3093\u3066\u3044\u3046\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u304c\u3001\r\n        \/\/ \u30af\u30e9\u30b9A\u304b\u3089\u7d99\u627f\u3057\u3066\u3044\u308b\u306e\u3060\u304b\u3089\u6301\u3063\u3066\u3044\u308b\u306e\u3082\u540c\u7136\u3002\r\n\r\n\r\n        echo $this->private_var . PHP_EOL;\r\n        \/\/ => 'private var in A'\r\n        \/\/\r\n        \/\/ $b->private_var  \u3060\u3068\u8003\u3048\u308c\u3070 'private var in B' \u306b\u306a\u308a\u305d\u3046\u3060\u304c\u2026\u3000\u306f\u3066\u2026!?\r\n\r\n\r\n        echo $this->private_var_that_only_A_has . PHP_EOL;\r\n        \/\/ => 'private var that only A has'\r\n        \/\/\r\n        \/\/ $b->private_var_that_only_A_has  \u3060\u3068\u8003\u3048\u308c\u3070\u4e0d\u81ea\u7136\u3060\u3088\u306d?\r\n        \/\/ \u30af\u30e9\u30b9B\u306f A::private_var_that_only_A_has \u3092\u7d99\u627f\u3057\u3066\u3044\u306a\u3044\u306e\u306b\u3001\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u3002\r\n        \/\/ \u3068\u3044\u3046\u3053\u3068\u306f\u3001private\u306a \u30d7\u30ed\u30d1\u30c6\u30a3\/\u30e1\u30bd\u30c3\u30c9 \u3067\u3042\u3063\u3066\u3082\u3001\r\n        \/\/ \u672c\u5f53\u306f\u7d99\u627f\u306f\u3055\u308c\u308b\u3051\u3069\u3001\u5b9f\u884c\u6642\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u304c\r\n        \/\/ \u305d\u306e \u30d7\u30ed\u30d1\u30c6\u30a3\/\u30e1\u30bd\u30c3\u30c9 \u3092\u5b9a\u7fa9\u3057\u305f\u30af\u30e9\u30b9(\u3053\u306e\u5834\u5408\u30af\u30e9\u30b9A)\u3067\u3042\u308b\u5834\u5408\u306e\u307f\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u3002\r\n\r\n\r\n        $this->baz();\r\n        \/\/ => 'baz in A (private method)'\r\n        \/\/\r\n        \/\/ $b->baz() \u3057\u3066\u3044\u308b\u306e\u306b\u3082\u95a2\u308f\u3089\u305a\u3001\u5b9f\u969b\u306f A::baz() \u304c\u547c\u3070\u308c\u305f!\r\n        \/\/ \u3084\u306f\u308a\u3053\u306e\u6319\u52d5\u306e\u539f\u56e0\u306f\u300c\u5b9f\u884c\u6642\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u304c\u30af\u30e9\u30b9A\u300d\u3060\u3068\u601d\u308f\u308c\u308b\u3002\r\n\r\n\r\n        $this->foobar();\r\n        \/\/ => 'foobar in B (protected method)'\r\n        \/\/\r\n        \/\/ $b->foobar()  \u3060\u3068\u8003\u3048\u308c\u3070\u7d0d\u5f97\u3060\u3088\u306d\uff01\r\n        \/\/ \u30af\u30e9\u30b9B \u306f \u30af\u30e9\u30b9A \u306e foobar \u30e1\u30bd\u30c3\u30c9\u3092\u4e0a\u66f8\u304d\u3057\u305f\u304b\u3089\u3001\u5f53\u7136\u306e\u7d50\u679c\u3060\u306d\u3002\r\n\r\n\r\n        $this->qux();\r\n        \/\/ => Fatal error: Call to private method B::qux() from context 'A'\r\n        \/\/ $b->qux()  \u3060\u3068\u8003\u3048\u308c\u3070\u30b3\u30fc\u30eb\u3067\u304d\u305d\u3046\u3060\u304c\u3001\u5b9f\u969b\u306f\u30a8\u30e9\u30fc!\r\n        \/\/ \u5b9f\u884c\u6642\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u304c 'A' \u3060\u304b\u3089\u3001B::qux() \u306b\u306f\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u3089\u3057\u3044\u3002\r\n\r\n\r\n        \/\/ * ======  \u7d50\u8ad6  ====== *\r\n        \/\/ private\u306a \u30e1\u30f3\u30d0\u30fc(\u30e1\u30bd\u30c3\u30c9\/\u30d7\u30ed\u30d1\u30c6\u30a3) \u3092\u53c2\u7167\u3059\u308b\u6642\u3001\r\n        \/\/ \u5b9f\u884c\u6642\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u5185( $this \u304c\u66f8\u304b\u308c\u305f\u30af\u30e9\u30b9\u5185 )\u306e \u30e1\u30bd\u30c3\u30c9\/\u30d7\u30ed\u30d1\u30c6\u30a3 \u3092\u512a\u5148\u3057\u3066\u53c2\u7167\u3057\u3088\u3046\u3068\u3059\u308b\u30af\u30bb\u304c\u3042\u308b\u3002\r\n        \/\/ \u8a00\u3044\u63db\u3048\u308c\u3070\u3001private\u306a \u30e1\u30f3\u30d0\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u304b\u3069\u3046\u304b\u306f\u3001\u5b9f\u884c\u6642\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3067\u6c7a\u307e\u308b\u3002\r\n    }\r\n\r\n    private function baz()\r\n    {\r\n        echo \"baz in A (private method)\" . PHP_EOL;\r\n    }\r\n\r\n    protected function foobar()\r\n    {\r\n        echo \"foobar in A (protected method)\" . PHP_EOL;\r\n    }\r\n}\r\n\r\nclass B extends A\r\n{\r\n    private $private_var = 'private var in B';\r\n    protected $protected_var = 'protected var in B';\r\n\r\n    public function bar()\r\n    {\r\n        $this->foo();\r\n    }\r\n\r\n    private function baz()\r\n    {\r\n        echo \"baz in B (private method)\" . PHP_EOL;\r\n    }\r\n\r\n    protected function foobar()\r\n    {\r\n        echo \"foobar in B (protected method)\" . PHP_EOL;\r\n    }\r\n\r\n    private function qux()\r\n    {\r\n        echo \"qux in B (private method)\" . PHP_EOL;\r\n    }\r\n}\r\n\r\n\r\n$b = new B;\r\n$b->bar();\r\n\r\n\r\n\/\/ \u5b9f\u884c\u7d50\u679c:\r\n\/\/\r\n\/\/ $b is a instance of B, and $b identical to $this\r\n\/\/ protected var in B\r\n\/\/ protected var to be inherited from A\r\n\/\/ private var in A\r\n\/\/ private var that only A has\r\n\/\/ baz in A (private method)\r\n\/\/ foobar in B (protected method)\r\n\/\/\r\n\/\/ Fatal error: Call to private method B::qux() from context 'A'<\/pre>\n
\u3053\u306e\u5b9f\u9a13\u3067\u5206\u304b\u3063\u305f\u3053\u3068<\/h3>\n
$this<\/code>\u304c\u53c2\u7167\u3059\u308b\u30e1\u30f3\u30d0\u30fc\u304cprivate<\/code>\u306e\u5834\u5408\u3001\u5e38\u306b\u5b9f\u884c\u6642\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u5185(\u305d\u306e$this<\/code>\u304c\u66f8\u304b\u308c\u305f\u30af\u30e9\u30b9\u5185)\u306eprivate<\/code>\u306a\u30e1\u30f3\u30d0\u30fc\u3092\u53c2\u7167\u3059\u308b\u3002<\/p>\n
\u8a00\u3044\u63db\u3048\u308c\u3070\u3001private\u306a \u30e1\u30f3\u30d0\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u304b\u3069\u3046\u304b\u306f\u3001\u5b9f\u884c\u6642\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3067\u6c7a\u307e\u308b\u3002<\/p>\n
\u672c\u5f53\u306b\u3061\u3089\u3063\u3068\u3060\u3051\u3067\u3059\u304c\u3001\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b\u3082\u3001\u3053\u306e\u5b9f\u9a13\u7d50\u679c\u3092\u88cf\u4ed8\u3051\u308b\u8a18\u8ff0\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
$this-> \u306f private \u30e1\u30bd\u30c3\u30c9\u3092\u540c\u3058\u30b9\u30b3\u30fc\u30d7\u304b\u3089\u30b3\u30fc\u30eb\u3057\u3088\u3046\u3068\u3059\u308b<\/p><\/blockquote>\n
protected<\/code>\u3068public<\/code>\u306f\u4e88\u60f3\u901a\u308a\u306e\u7d50\u679c\u306b\u306a\u308b\u306e\u3067\u3001\u7279\u7b46\u3059\u3079\u304d\u3068\u3053\u308d\u306f\u306a\u3044\u306e\u3067\u3059\u304c\u3001\u56f0\u3063\u305f\u3053\u3068\u306b\u3001static::\u306b\u3088\u308bprivate\u306a\u30e1\u30f3\u30d0\u30fc\u3078\u306e\u30a2\u30af\u30bb\u30b9\u306e\u5834\u5408\u306f\u307e\u305f\u6319\u52d5\u304c\u9055\u3044\u307e\u3059\u2026 \u8a73\u3057\u304f\u306f\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3092\u3054\u89a7\u4e0b\u3055\u3044\u3002<\/p>\n
PHP\u306e\u300c\u9045\u5ef6\u9759\u7684\u675f\u7e1b (Late Static Bindings)\u300d\u6a5f\u80fd\u3001\u89e3\u8aad\uff01<\/a><\/p>\n
\u3082\u3046\u3061\u3087\u3063\u3068\u62e1\u5f35<\/h3>\n
\u4e0a\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306b\u3082\u3042\u308b\u3088\u3046\u306b\u3001$this<\/code>\u306e\u5b9f\u4f53\u306f\u300c\u3068\u3042\u308b\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u300d\u3067\u3059\u3002\u305d\u308c\u304c\u5206\u304b\u308c\u3070\u3001\u3053\u3093\u306a\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3082\u7d0d\u5f97\u304c\u3044\u304f\u306f\u305a\u3067\u3059\u3002<\/p>\n
<?php\r\n\r\nclass A\r\n{\r\n    private $private_var = 'private_var in A';\r\n\r\n    public function set_private_var(A $object, $value)\r\n    {\r\n        \/\/ \u6e21\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e private \u306a\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u8a2d\u5b9a\u3057\u3066\u3044\u308b\r\n        \/\/ \u3082\u3061\u308d\u3093\u3001\u3053\u308c\u304c\u3067\u304d\u308b\u524d\u63d0\u306f\u305d\u306e\u6e21\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30bf\u30a4\u30d7\u304c `A` \u3067\u3042\u308b\u3053\u3068\u3002\r\n        $object->private_var = $value;\r\n    }\r\n\r\n    public function print_private_var()\r\n    {\r\n        echo $this->private_var . PHP_EOL;\r\n    }\r\n}\r\n\r\nclass B extends A\r\n{\r\n}\r\n\r\n\r\n$b = new B;\r\n$b->print_private_var(); \/\/ => 'private_var in A'\r\n\r\n$b->set_private_var($b, 'new value!');\r\n$b->print_private_var(); \/\/ => 'new value!'<\/pre>\n
\u307e\u3068\u3081<\/h2>\n
\n
$this<\/code>\u306f\u5e38\u306b\u30eb\u30fc\u30c8\u306e\u547c\u3073\u51fa\u3057\u5143\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3042\u308b\u3002<\/li>\n
$this<\/code>\u304c\u53c2\u7167\u3059\u308b\u30e1\u30f3\u30d0\u30fc\u304cprivate<\/code>\u306e\u5834\u5408\u3001\u5e38\u306b\u5b9f\u884c\u6642\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u5185(\u305d\u306e$this<\/code>\u304c\u66f8\u304b\u308c\u305f\u30af\u30e9\u30b9\u5185)\u306eprivate<\/code>\u306a\u30e1\u30f3\u30d0\u30fc\u3092\u53c2\u7167\u3059\u308b\u3002<\/li>\n<\/ul>\n
\u3053\u308c\u3067\u3060\u3044\u3076\u8ff7\u3044\u304c\u6d88\u3048\u307e\u3057\u305f\u3002\u3088\u304b\u3063\u305f\u3088\u304b\u3063\u305f\u301c<\/p>\n","protected":false},"excerpt":{"rendered":"
PHP\u306e\u30a2\u30af\u30bb\u30b9\u6a29\u30ad\u30fc\u30ef\u30fc\u30c9 \u00a0private\u00a0\u3068\u7591\u4f3c\u5909\u6570 $this\u3001\u3069\u3061\u3089\u3082\u79c1\u304c\u521d\u5fc3\u8005\u306e\u9803\u304b\u3089\u6163\u308c\u89aa\u3057\u3093\u3067\u304d\u305f\u30ef\u30fc\u30c9\u3060\u3057\u3001\u65e5\u5e38\u7684\u306b\u3082\u304a\u4e16\u8a71\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3059\u3002 \u304a\u6065\u305a\u304b\u3057\u3044\u8a71\u3067\u3059\u304c\u3001\u3064\u3044\u6700\u8fd1\u307e\u3067\u306f\u5b9f\u306f\u5206\u304b\u308b\u3088\u3046\u3067\u5206\u304b…<\/p>\n","protected":false},"author":2,"featured_media":1973,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"amp_status":"","spay_email":"","footnotes":""},"categories":[32,7],"tags":[],"jetpack_featured_media_url":"https:\/\/1design.jp\/wp-content\/uploads\/2016\/10\/eyecatch-visibility.jpg","jetpack_shortlink":"https:\/\/wp.me\/p6Y4kL-uC","_links":{"self":[{"href":"https:\/\/1design.jp\/wp-json\/wp\/v2\/posts\/1898"}],"collection":[{"href":"https:\/\/1design.jp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/1design.jp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/1design.jp\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/1design.jp\/wp-json\/wp\/v2\/comments?post=1898"}],"version-history":[{"count":51,"href":"https:\/\/1design.jp\/wp-json\/wp\/v2\/posts\/1898\/revisions"}],"predecessor-version":[{"id":1985,"href":"https:\/\/1design.jp\/wp-json\/wp\/v2\/posts\/1898\/revisions\/1985"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/1design.jp\/wp-json\/wp\/v2\/media\/1973"}],"wp:attachment":[{"href":"https:\/\/1design.jp\/wp-json\/wp\/v2\/media?parent=1898"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/1design.jp\/wp-json\/wp\/v2\/categories?post=1898"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/1design.jp\/wp-json\/wp\/v2\/tags?post=1898"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}