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31 lines
572 B
31 lines
572 B
<?php
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/**
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* 类里面的常量
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*/
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use classA as GlobalClassA;
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class classA
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{
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//定义类常量
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const a='hello';
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function func()
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{
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//在类的方法中调用类常量
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echo self::a.'<br>';
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}
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}
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//直接调用类常量
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echo classA::a.'<br>';
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//对象::类常量
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$obj = new ClassA();
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echo $obj::a.'<br>';
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echo $obj->a.'<br>'; //对象不能访问类常量，会报“Undefined property: classA::$a”
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//对象中方法调用类常量
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echo $obj->func();
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?>
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