Multidimensional associative unique - php

Question

I have 2x multidimensional array's as show below:
$x = [
0=>[
'a',
'b'
],
1=>[
'c',
'd'
],
2=>[
'e',
'f'
]
];
$y = [
0=>[
'b',
'a'
],
1=>[
'g',
'h'
],
2=>[
'i',
'j'
]
];
I would like to merge the 2x array's (x and y) with an output like this
$xy = [
0=>[
'c',
'd'
],
1=>[
'e',
'f'
],
2=>[
'g',
'h'
],
3=>[
'i',
'j'
]
];
As you can see, $x[0] is equal to a,b and $y[0] equal to b,a and they are duplicated. I would like to know if it's possible for a,b as same as b,a , I don't know how to get my code to look like this. I want to eliminate my duplicated array (a,b != b,a). Any duplication are not allowed, is that possible?

Answer 1

This should give you exactly what you've requested. I've used multiple foreach() loops to test if the value is firstly part of the $Y array, if so then remove from both arrays using unset(). I've then merged the two arrays together, removed the empty array dimensions and reset the key count.
$x = [0=>['a','b'],1=>['c','d'],2=>['e','f']];
$y = [ 0=>['b','a'],1=>['g','h'],2=>['i','j']];
foreach ($x as $key=>$value) {
foreach($x[$key] as $k=>$v) {
$search = array_search($v, $y[$key], true); //Find if value is equal to value in Y using a search
if ($search !== false) { //If so then remove value
unset($y[$key][$search]); //Remove from Array Y
unset($x[$key][$search]); //Remove from Array X
}
}
}
$newArray = array_merge($x, $y); //Merge two arrays together
foreach($newArray as $key => $value) { //Remove empty dimensions from Array
if (count($newArray[$key]) <= 0) {
unset($newArray[$key]);
}
}
$newArray = array_values($newArray); //Re-Number Keys so there in order
var_dump($newArray); //Array Output
Output
{
[0] => array(2) {
[0] => string(1)
"c" [1] => string(1)
"d"
}[1] => array(2) {
[0] => string(1)
"e" [1] => string(1)
"f"
}[2] => array(2) {
[0] => string(1)
"g" [1] => string(1)
"h"
}[3] => array(2) {
[0] => string(1)
"i" [1] => string(1)
"j"
}
}
Edit
Added unset() to remove value from both arrays as it's mentions that you would NOT like to have duplicate data from either array shown in new array.