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(; <?php $arrays = array( 0 => array( 0 => 'one', 1 => 'two', 2 => 'three' ), 1 => array( 0 => 'four', 1 => 'five', 2 => 'six' ), 2 => array( 0 => 'seven', 1 => 'eight', 2 => 'nine' ) ); print_r(array_reduce($arrays, function($carry, $item) { return array_merge($carry, $item); }));
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/nSUmI:9 Stack trace: #0 /in/nSUmI(9): array_merge(NULL, Array) #1 [internal function]: {closure}(NULL, Array) #2 /in/nSUmI(9): array_reduce(Array, Object(Closure)) #3 {main} thrown in /in/nSUmI on line 9
Process exited with code 255.

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