Online PHP editor | output for A8JaL

<?php function unique_multidim_array($array, $key) { $uniq = []; foreach($array as $val) { $curVal = $val[$key]; // shortcut of the value $uniq[$curVal] = $val; // override previous value if exists } return array_values($uniq); // array_values to re-index array } $exists = [ ['intervention_id' => 2, 'exists' => 'yes'], ['intervention_id' => 2, 'exists' => 'no'], ['intervention_id' => 2, 'exists' => 'yes'], ['intervention_id' => 5, 'exists' => 'yes'], ['intervention_id' => 6, 'exists' => 'no'], ['intervention_id' => 12, 'exists' => 'yes'], ]; $uniq = unique_multidim_array($exists, 'intervention_id'); print_r($uniq);