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@ 2015-04-20T06:25:04Z

<?php

class A {
    public static $a = "foo";
}

$foo = "a";

var_dump(isset(A::$$foo));

$foo = "b";

var_dump(isset(A::$$foo));

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

40.42 ms | 402 KiB | 5 Q