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@ 2014-07-13T17:54:05Z

<?php

class Client {

    const QUERY_SELECT = 'foo';

}

$const = 'QUERY_SELECT';
echo constant("Client::{$const}");

Output
Performance
VLD
References
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constant: documentation ( source)

preferences:dark modelive preview

60.82 ms | 402 KiB | 5 Q