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<?php $array1 = array('id_0' => '2975', 'title_0' => 'first_title', 'amount_0' => '1', 'price_0' => 55, 'id_1' => '2975', 'title_1' => 'first_title', 'amount_1' => '1', 'price_1' => 55, 'id_2' => '2973', 'title_2' => 'second_title', 'amount_2' => '1', 'price_2' => 95, ); $res =array(); While(count($array1)){ $res[] = array_splice($array1, 0,4); } Var_dump($res);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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 - 8.3.27, 8.4.1 - 8.4.14
array(3) { [0]=> array(4) { ["id_0"]=> string(4) "2975" ["title_0"]=> string(11) "first_title" ["amount_0"]=> string(1) "1" ["price_0"]=> int(55) } [1]=> array(4) { ["id_1"]=> string(4) "2975" ["title_1"]=> string(11) "first_title" ["amount_1"]=> string(1) "1" ["price_1"]=> int(55) } [2]=> array(4) { ["id_2"]=> string(4) "2973" ["title_2"]=> string(12) "second_title" ["amount_2"]=> string(1) "1" ["price_2"]=> int(95) } }

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