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@ 2014-10-22T15:07:11Z

<?php

$root = array_map(function($v) { return 'cat'.$v; }, range(1,10)); //array( 1=>'cat1', 2=>'cat2', 3=>'cat3' );
$child_1 = array_map(function($v) { return 'sub_cat'.$v; },range(1,16)); //array( 1=>'sub_cat1', 2=>'sub_cat2', 3=>'sub_cat3' );
$child_2 = array_map(function($v) { return 'sub_sub_cat'.$v; },range(1.30)); //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) {
		$kdi = $kd;
		array_push($kdi, $ck);
		$vdi = $vd;
		array_push($vdi, $cv);
		if(!empty($source_arrays)) {
			$return += getAllCombinationsArray($source_arrays, $kdi, $vdi);
		} else {
			$return[implode('_', $kdi)] = implode(' -> ', $vdi);
		}
	}
	
    return $return;         
}

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

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught ArgumentCountError: range() expects at least 2 arguments, 1 given in /in/fMPqR:5 Stack trace: #0 /in/fMPqR(5): range(1.3) #1 {main} thrown in /in/fMPqR on line 5
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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