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