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<?php $array = [ "tracker" => [ ["[", "asiangames", ",", "asiangames2018", ",", "asian", "]"], ["[", "2019gantipresiden", "]"] ] ]; foreach ($array["tracker"] as &$tracker) { $tracker = array_diff($tracker, ["[", ",", "]"]); } var_export($array);
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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.7
array ( 'tracker' => array ( 0 => array ( 1 => 'asiangames', 3 => 'asiangames2018', 5 => 'asian', ), 1 => array ( 1 => '2019gantipresiden', ), ), )

preferences:
105.23 ms | 1634 KiB | 4 Q