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@ 2014-07-29T09:16:34Z

<?php

class A {
    protected static $_b = null;


    public static function bExists()
    {
        var_dump(isset(static::$_b));
    }
}

A::bExists();

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

38.2 ms | 402 KiB | 5 Q