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@ 2013-09-26T17:52:42Z

<?php
    $mainArray = array(23 => array(21,23,20), 21 => array(21,23,23), 24 => array(21,23,20));
    $newArray = array();
    foreach($mainArray as $key => $value) {
      if (in_array(20, $value)) {
        $newArray[] = $key;
      }
    }
    echo var_dump($newArray);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
in_array: documentation ( source)

preferences:dark modelive preview

32.88 ms | 402 KiB | 5 Q