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<?php // A function to sort by last name. function lastNameSort($a, $b) { $aLast = end(explode(' ', $a)); $bLast = end(explode(' ', $b)); return strcasecmp($aLast, $bLast); } // The array of data. $array = array( 27 => 'Sarah Green', 29 => 'Adam Brown', 68 => 'Fred Able' ); uasort($array, 'lastNameSort'); print_r($array); ?>
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