Online PHP editor | output for NZGjY

@ 2014-10-22T14:58:06Z

<?php

    $root = array( 1=>'cat1', 2=>'cat2', 3=>'cat3' );
    $child_1 = array( 1=>'sub_cat1', 2=>'sub_cat2', 3=>'sub_cat3' );
    $child_2 = array( 1=>'sub_sub_cat1', 2=>'sub_sub_cat2', 3=>'sub_sub_cat3' );

 function getAllCombinationsArray($source_arrays = array(), $kd = array(), $vd = array()){
    $return = array(); 
	
	foreach(array_shift($source_arrays) as $ck => $cv) {
		if(!empty($source_arrays)) {
			$return += getAllCombinationsArray($source_arrays, $kd + $ck, $vd + $cv);
		} else {
			$return[implode('_', $kd)] = implode(' -> ', $vd);
		}
	}
	
    return $return;         
}

print_r(getAllCombinationsArray(array($root, $child_1, $child_2)));

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7: Fatal error: Uncaught TypeError: Unsupported operand types: array + int in /in/NZGjY:12 Stack trace: #0 /in/NZGjY(21): getAllCombinationsArray(Array) #1 {main} thrown in /in/NZGjY on line 12
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33: Fatal error: Uncaught Error: Unsupported operand types in /in/NZGjY:12 Stack trace: #0 /in/NZGjY(21): getAllCombinationsArray(Array) #1 {main} thrown in /in/NZGjY on line 12
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28: Fatal error: Unsupported operand types in /in/NZGjY on line 12
Process exited with code 255.
Output for 4.3.0 - 4.3.1: Fatal error: Unsupported operand types in /in/NZGjY on line 12

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