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run code in 150+ php & hhvm versions
Bugs & Features
<?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)));
based on ik11v
Output for 7.0.0 - 7.1.0
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 hhvm-3.12.0
Fatal error: Invalid operand type was used: cannot perform this operation with arrays in /in/NZGjY on line 12
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.2 - 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