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@ 2015-04-20T14:12:58Z

<?php

$first = array(
    'abc' => array()
);

$alias = '30000';

var_dump(array_merge($first, array($alias => [])));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_merge: documentation ( source)

preferences:dark modelive preview

47.8 ms | 402 KiB | 5 Q