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@ 2015-11-30T08:52:50Z

<?php

class A {
    const TEST = false;
    
    public function test()
    {
        var_dump(static::TEST, static::who());
    }
    
    public function who()
    {
        return 'A';
    }
}

class B extends A {
    const TEST = true;
    
    public function test()
    {
        A::test();
    }
    
    public function who()
    {
        return 'B';
    }
}

$b = new B;
$b->test();

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

60.7 ms | 402 KiB | 5 Q