<?php $array = [ ['user_id' => 82, 'ac_type' => 1], ['user_id' => 80, 'ac_type' => 5], ['user_id' => 76, 'ac_type' => 1], ['user_id' => 82, 'ac_type' => 2], ['user_id' => 80, 'ac_type' => 5] ]; foreach ($array as $a) { $result[$a['user_id']] ??= $a; // only store if first occurrence of user_id } var_export(array_values($result)); // re-index and print
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