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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 //访问函数要用箭头，属性要用双冒号 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; //访问自己的(静态)函数 print $this->staticFunc(); //强制指定访问父类(而不是自己)的函数 print parent::func(); } //覆盖父类的静态函数 static public function staticFunc() { //因为没有$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; $xxoo->func(); B::staticFunc();
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
properties staticProperty constValue staticProperty covered-properties staticProperty covered-staitcProperties Fatal error: Uncaught Error: Access to undeclared static property A::$staitcProperty in /in/4agBY:78 Stack trace: #0 /in/4agBY(67): B::staticFunc() #1 /in/4agBY(84): B->func() #2 {main} thrown in /in/4agBY on line 78
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 properties staticProperty constValue staticProperty covered-properties staticProperty covered-staitcProperties Fatal error: Uncaught Error: Access to undeclared static property A::$staitcProperty in /in/4agBY:78 Stack trace: #0 /in/4agBY(67): B::staticFunc() #1 /in/4agBY(84): B->func() #2 {main} thrown in /in/4agBY on line 78
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
properties staticProperty constValue staticProperty covered-properties staticProperty covered-staitcProperties Fatal error: Uncaught Error: Access to undeclared static property: A::$staitcProperty in /in/4agBY:78 Stack trace: #0 /in/4agBY(67): B::staticFunc() #1 /in/4agBY(84): B->func() #2 {main} thrown in /in/4agBY on line 78
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
properties staticProperty constValue staticProperty covered-properties staticProperty covered-staitcProperties Fatal error: Access to undeclared static property: A::$staitcProperty in /in/4agBY on line 78
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_PAAMAYIM_NEKUDOTAYIM in /in/4agBY on line 39
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_PAAMAYIM_NEKUDOTAYIM in /in/4agBY on line 39
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/4agBY 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/4agBY 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/4agBY on line 9
Process exited with code 255.
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