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@ 2016-01-26T13:14:01Z

<?php

class Foo {
   const BAR = ['baz' => 'qux'];

   function quux() {
      var_dump(isset(self::BAR['foo']));
   }
}

$f = new Foo();
$f->quux();

Output
Performance
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var_dump: documentation ( source)

preferences:dark modelive preview

60.03 ms | 402 KiB | 5 Q