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This article mainly introduces the difference between class static calling and range resolution operators in PHP. Friends who need it can refer to it. I hope it can help everyone.
The specific code is as follows:
<?php //在子类或类内部用“::”调用本类或父类时,不是静态调用方法,而是范围解析操作符。 class ParentClass { public static $my_static = 'parent var '; function test() { self::who(); // 输出 'parent' 是范围解析,不是静态调用 $this->who(); // 输出 'child' static::who(); // 延迟静态绑定 是范围解析,不是静态调用 } function who() { echo 'parent<br>'; } } class ChildClass extends ParentClass { public static $my_static = 'child var '; function who() { echo 'child<br>'; } } $obj = new ChildClass(); $obj->test(); echo ChildClass::$my_static;//静态调用
The above output
parent
child
child
child var
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