cartesian product with PHP (id, name, variants) - php

Question

Can you help me with generating caresian product.
It is similar to this stackoverflow. I want generate inputs so I need keep ID.
Example:
my input data:
[
1 => [
id => 1,
name => "Color",
options => [
5 => [
id => 5,
name => "Red"
],
6 => [
id => 6,
name => "Blue"
]
]
],
2 => [
id => 2,
name => "Size",
options => [
7 => [
id => 7,
name => "S"
],
8 => [
id => 8,
name => "M"
]
]
],
// etc
]
result I expect:
[
"5-7" => "Red / S",
"5-8" => "Red / M",
"6-7" => "Blue / S",
"6-8" => "Blue / M"
]
I need generic function for any number of properties/options..

Answer 1

Nested loop man, each entry of array 1 has to be linked with every entry of array2.
$finalArray = array();
foreach (array1 as $key1 as $value1){
foreach (array2 as $key2 as$value2){
echo $value1 . " - " .$value2."<br/>";
$finalArray[$key1.'-'.$key2] = $value1 ." - ".$value2;
}
}
the finalArray will be having what you need.

Answer 2

That is actually working code for now but don't know how much is efficient.
// filter out properties without options
$withOptions = array_filter($properties, function($property) {
return count($property['options']) > 0;
});
$result = [];
$skipFirst = true;
foreach ($withOptions as $property) {
if ($skipFirst) {
foreach (reset($withOptions)['options'] as $id => $option) {
$result[$id] = $option['name'];
}
$skipFirst = false;
continue;
}
foreach ($result as $code => $variant) {
foreach ($property['options'] as $id => $option) {
$new = $code . "-" . $id;
$result[$new] = $variant . " / " . $option['name'];
unset($result[$code]);
}
}
}