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run code in 150+ php & hhvm versions
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<?php $arr = array( Array('weight' => '317.51474856007','reps' => '10'), Array('weight' => 50,'reps' => 10), Array('reps' => 10), Array('reps' => 10) ); $count = array(); array_walk_recursive($arr, function($v, $k) use ($count){if(array_key_exists($k, $count))$count[$k]++;else $count[$k]=1;}); print_r($arr);
based on l65rC
Output for 5.3.0 - 7.1.0
Array ( [0] => Array ( [weight] => 317.51474856007 [reps] => 10 ) [1] => Array ( [weight] => 50 [reps] => 10 ) [2] => Array ( [reps] => 10 ) [3] => Array ( [reps] => 10 ) )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/6e3YT on line 10
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/6e3YT on line 10
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/6e3YT on line 10
Process exited with code 255.