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<?php $arr = array( array("item_data"=>array(1,2,3)), array("item_data"=>array(4,5,6)), array("item_data"=>array(7,8,9)) ); function merge($prev, $now) { return array_merge($prev, $now['item_data']); } $res = array_reduce($arr, "merge"); var_dump($res);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_merge(): Argument #1 must be of type array, null given in /in/QIQPO:6 Stack trace: #0 /in/QIQPO(6): array_merge(NULL, Array) #1 [internal function]: merge(NULL, Array) #2 /in/QIQPO(8): array_reduce(Array, 'merge') #3 {main} thrown in /in/QIQPO on line 6
Process exited with code 255.

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