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<?php // 费了我好大功夫, 把这些都总结到一个例子里面了 // PHP5.0 - PHP5.5 测试通过 class A { //类常量 const constValue = "constValue\n"; //类属性 public $property = "properties\n"; //静态属性 static public $staticProperty = "staticProperty\n"; //普通函数 public function func() { } //静态函数 static public function staticFunc() { } } $xxoo = new A; //访问实例的属性 print $xxoo->property; //访问实例的函数 print $xxoo->func(); //也可以借助实例来访问静态成员 print $xxoo->staticFunc(); print $xxoo->staticProperty; //如果不借助实例，那就直接用类名加双冒号 print A::staticFunc(); print A::constValue; //静态属性要加美元符号 print A::$staticProperty; //继承类A class B extends A { //覆盖父类的属性 public $property = "covered-properties\n"; //覆盖父类的静态属性 static public $staitcProperty = "covered-staitcProperties\n"; //覆盖父类的函数 public function func() { //访问自己的属性 print $this->property; //访问从父类继承来的静态属性 print self::$staticProperty; //强制指定访问父类(而不是自己)的属性 print parent::$property; //强制指定访问父类(而不是自己)的函数 print parent::func(); } //覆盖父类的静态函数 static public function staticFunc() { //因为没有$this, 所以用self访问自己的静态属性 print self::$staitcProperty; //强制访问父类的静态属性 print parent::$staitcProperty; } } //运行一下上面的例子 $xxoo = new B; $xxoo->func(); B::staticFunc();
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
properties Notice: Accessing static property A::$staticProperty as non static in /in/7D35A on line 38 Warning: Undefined property: A::$staticProperty in /in/7D35A on line 38 constValue staticProperty covered-properties staticProperty Fatal error: Uncaught Error: Access to undeclared static property A::$property in /in/7D35A:66 Stack trace: #0 /in/7D35A(83): B->func() #1 {main} thrown in /in/7D35A on line 66
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
properties Notice: Accessing static property A::$staticProperty as non static in /in/7D35A on line 38 Notice: Undefined property: A::$staticProperty in /in/7D35A on line 38 constValue staticProperty covered-properties staticProperty Fatal error: Uncaught Error: Access to undeclared static property: A::$property in /in/7D35A:66 Stack trace: #0 /in/7D35A(83): B->func() #1 {main} thrown in /in/7D35A on line 66
Process exited with code 255.
Output for 7.3.32 - 7.3.33, 7.4.26
properties constValue staticProperty covered-properties staticProperty Fatal error: Uncaught Error: Access to undeclared static property: A::$property in /in/7D35A:66 Stack trace: #0 /in/7D35A(83): B->func() #1 {main} thrown in /in/7D35A on line 66
Process exited with code 255.
Output for 5.2.6 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.37, 5.6.0 - 5.6.28
properties Strict Standards: Accessing static property A::$staticProperty as non static in /in/7D35A on line 38 Notice: Undefined property: A::$staticProperty in /in/7D35A on line 38 constValue staticProperty covered-properties staticProperty Fatal error: Access to undeclared static property: A::$property in /in/7D35A on line 66
Process exited with code 255.
Output for 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.5
properties Strict Standards: Accessing static property A::$staticProperty as non static in /in/7D35A on line 38 Notice: Undefined property: A::$staticProperty in /in/7D35A on line 38 constValue staticProperty covered-properties staticProperty Fatal error: Access to undeclared static property: A::$property in /in/7D35A on line 66
Process exited with code 255.
Output for 5.0.0 - 5.0.4
properties Notice: Undefined property: A::$staticProperty in /in/7D35A on line 38 constValue staticProperty covered-properties staticProperty Fatal error: Access to undeclared static property: A::$property in /in/7D35A on line 66
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_CONST, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/7D35A on line 9
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_CONST, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/7D35A on line 9
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/7D35A on line 9
Process exited with code 255.
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