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<?php $objs = [ ['value'=>2, 'key'=>'a'], ['value'=>3, 'key'=>'b'] ]; $keys = array_column($objs, 'key'); $index = array_search('c', $keys); $objs[$index]['key'] = 5; var_dump($objs);
Output for 5.6.38, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array(2) { [0]=> array(2) { ["value"]=> int(2) ["key"]=> int(5) } [1]=> array(2) { ["value"]=> int(3) ["key"]=> string(1) "b" } }

preferences:
99.78 ms | 408 KiB | 5 Q