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<?php $arr = array( array("item_data"=>array(1,2,3),"type"=>a), array("item_data"=>array(4,5,6)), array("item_data"=>array(7,8,9)) ); var_dump($arr); function merge($prev, $now) { return array_merge($prev, $now['item_data']); } $res = array_reduce($arr, "merge", array()); print_r($res);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught Error: Undefined constant "a" in /in/Hu0at:3 Stack trace: #0 {main} thrown in /in/Hu0at on line 3
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: Use of undefined constant a - assumed 'a' (this will throw an Error in a future version of PHP) in /in/Hu0at on line 3 array(3) { [0]=> array(2) { ["item_data"]=> array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) } ["type"]=> string(1) "a" } [1]=> array(1) { ["item_data"]=> array(3) { [0]=> int(4) [1]=> int(5) [2]=> int(6) } } [2]=> array(1) { ["item_data"]=> array(3) { [0]=> int(7) [1]=> int(8) [2]=> int(9) } } } Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 [8] => 9 )
Output for 4.3.0 - 4.3.9, 5.0.0 - 5.0.2, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33
Notice: Use of undefined constant a - assumed 'a' in /in/Hu0at on line 3 array(3) { [0]=> array(2) { ["item_data"]=> array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) } ["type"]=> string(1) "a" } [1]=> array(1) { ["item_data"]=> array(3) { [0]=> int(4) [1]=> int(5) [2]=> int(6) } } [2]=> array(1) { ["item_data"]=> array(3) { [0]=> int(7) [1]=> int(8) [2]=> int(9) } } } Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 [8] => 9 )
Output for 5.0.3 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Notice: Use of undefined constant a - assumed 'a' in /in/Hu0at on line 3 array(3) { [0]=> array(2) { ["item_data"]=> array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) } ["type"]=> string(1) "a" } [1]=> array(1) { ["item_data"]=> array(3) { [0]=> int(4) [1]=> int(5) [2]=> int(6) } } [2]=> array(1) { ["item_data"]=> array(3) { [0]=> int(7) [1]=> int(8) [2]=> int(9) } } } Warning: array_merge(): Argument #1 is not an array in /in/Hu0at on line 6 Warning: array_merge(): Argument #1 is not an array in /in/Hu0at on line 6 Warning: array_merge(): Argument #1 is not an array in /in/Hu0at on line 6
Output for 4.3.10 - 4.3.11, 4.4.0 - 4.4.9
Notice: Use of undefined constant a - assumed 'a' in /in/Hu0at on line 3 array(3) { [0]=> array(2) { ["item_data"]=> array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) } ["type"]=> string(1) "a" } [1]=> array(1) { ["item_data"]=> array(3) { [0]=> int(4) [1]=> int(5) [2]=> int(6) } } [2]=> array(1) { ["item_data"]=> array(3) { [0]=> int(7) [1]=> int(8) [2]=> int(9) } } } Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 [6] => 6 [7] => 7 [8] => 8 [9] => 9 )

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