<?php $array = array("a1" => 0, "a2" => 2, "a3" => 1, "b1" => 2, "b2" => 3); $final_array=[]; foreach($array as $key=>$value){ $final_array[$key[0]] = (isset($final_array[$key[0]])) ? $final_array[$key[0]]+$value : $value; } print_r($final_array);
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Value for `_results` contains invalid data `array`