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@ 2013-09-07T09:55:00Z

<?php
$arr = array('aaa'=>'aaa', 'bbb'=>'bbb');
$k = 'bbb';
if(!array_key_exists($k,$arr))
$arr[$k] = 'ccc';
print_r($arr);

Output
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print_r: documentation ( source)

preferences:dark modelive preview

41.86 ms | 402 KiB | 5 Q