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Difference between class static call and scope resolution operator in PHP
Difference between class static call and scope resolution operator in PHP
This article mainly introduces the difference between class static calling and range resolution operators in PHP. Friends in need can refer to it
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
Summary
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