PHP - Print all the combinations - product - php

Question

I'm trying to solve a somewhat simple task but can't wrap my head around doing it without a lot of loops and messy code.
I want all to print all combinations of the array below:
$product = array(
array
(
'1X'
),
array
(
'X2'
)
);
producing the following result:
//ROW 1
1
X
//ROW 2
X
2
//ROW 3
1
2
//ROW 4
X
X

Answer 1

this work:
$product = array(
array
(
'1WQ'
),
array
(
'3'
),
array
(
'X'
)
);
//
class Combine{
private $product = array();
private $result = array();
private $format = array();
public function __construct($p=array()){
$this->product = $p;
}
public function process(){
foreach($this->product as $k=>$v){
$this->format[] = str_split($v[0]);
}
$this->result = $this->build();
return $this;
}
public function build()
{
if (!$this->format) {
return array(array());
}
$sub = array_shift($this->format);
$c = $this->build($this->format);
$res = array();
foreach ($sub as $v) {
foreach ($c as $p) {
array_unshift($p, $v);
$res[] = $p;
}
}
return $res;
}
public function response(){
return $this->result;
}
}
//
$combine = new Combine($product);
$resp = $combine->process()->response();
var_dump($resp);

Answer 2

function helperFunction($array, $index, $workArray)
{
$tempArray = array();
$tmpStr = $array[$index][0];
// loop over the current array characters
for( $i = 0; $i < strlen($tmpStr); $i++ )
{
$char = substr($tmpStr, $i, 1);
// first time - add characters to the work array
if (count($workArray) == 0)
{
$tempArray[] = $char;
}
// later round - add characters to existing items
else
{
foreach ($workArray as $workItem)
{
$tempArray[] = $workItem . $char;
}
}
}
// last round
if (count($array) == $index + 1)
{
return $tempArray;
}
// recursion round
else
{
return helperFunction($array, $index + 1, $tempArray);
}
}
$result = helperFunction($product, 0, array());