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@ 2014-04-11T16:13:14Z

<?php
$m = [];
$m['port'] = '';
! $m['port'] AND $m = array_diff_key($m, ['port'=>null]);

var_dump($m);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_diff_key: documentation ( source)

preferences:dark modelive preview

49.7 ms | 402 KiB | 5 Q