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@ 2017-07-11T14:15:46Z

<?php
function wer($x) {
    print_r($x);
    $x[0] = 'ttt';
}
$e = 'ert';
call_user_func('wer', [&$e]);
 print_r($e);

Output
Performance
VLD
References
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print_r: documentation ( source)

preferences:dark modelive preview

42.79 ms | 402 KiB | 5 Q