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@ 2015-04-09T14:53:58Z

<?php
$validations= array();
$invalid_member_ids = array_map(
    function($element)
    {
        return $element['respondentID'];
        
    }
    , $validations);

Output
Performance
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References
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array_map: documentation ( source)

preferences:dark modelive preview

40.07 ms | 402 KiB | 5 Q