Online PHP editor | refs for WBMNB

<?php $arr = array( Array('weight' => '317.51474856007','reps' => '10'), Array('weight' => 50,'reps' => 10), Array('reps' => 10), Array('reps' => 10) ); $count = array(); $count = array_map(function($v, $k)use($count){if(array_key_exists($k, $count))$count[$k]++;else $count[$k]=1;}, $arr); print_r($arr);