Comparing 2 Arrays using array_map? - php

Question

I wanted to refrain from using nested foreach in my actual code, so I was thinking of using an array function (correct me if I'm wrong) called array_walk thinking it would replace my code in foreach.
I wanted to compare both of the WHOLE array if they one of them have the same description, but the problem is array_walk only compares the first key/index and does not go through the second index to check. is there other way? I'm just trying to optimize my code
By the way, this code returns both found
<?php $array = array (
'1' => array(
'count' => '1',
'id' => 1,
'description' => 'Bag',
),
'2' => array(
'count' => '1',
'id' => 2,
'description' => 'Pencil',
), );
$bin = array (
'1' => array(
'count' => '1',
'id' => 2,
'description' => 'Bag',
),
'2' => array(
'count' => '1',
'id' => 2,
'description' => 'Pencil',
), );
$b = array_map(function($array, $bin) {
if ($array['description'] == $bin['description']){
$count = "found";
}else{
$count = "not found";
}
return array("status" => $count, "cart_array" => $array['description'], "bin"=>$bin['description']); }, $array, $bin);
var_dump($b);
?>
but this one, the first array doesnt return found, it should return
found because there is a pencil and bag in $bin array updated the code
<?php
$array = array (
'1' => array(
'count' => '1',
'id' => 1,
'description' => 'Bag',
),
'2' => array(
'count' => '1',
'id' => 2,
'description' => 'Pencil',
),
);
$bin = array (
'1' => array(
'count' => '1',
'id' => 2,
'description' => 'Pencil',
),
'2' => array(
'count' => '1',
'id' => 2,
'description' => 'Bag',
),
);
$b = array_map(function($array, $bin)
{
if ($array['description'] == $bin['description']){
$count = "found";
}else{
$count = "not found";
}
return array("status" => $count, "cart_array" => $array['description'], "bin"=>$bin['description']);
}, $array, $bin);
var_dump($b);
?>

Answer 1

Use array_column first to get all of description keys from $array. Then, you can check these values with $bin values.
$desc = array_column($array, 'description');
$b = array_map(function($array, $bin)
{
global $desc;
if (in_array($bin['description'], $desc)){
$count = "found";
}else{
$count = "not found";
}
return array("status" => $count, "cart_array" => $array['description'], "bin" => $bin['description']);
}, $array, $bin);
var_dump($b);

Answer 2

You don't have any expected output in the question but I assume you want to know the difference between them.
In the manual for array_diff there is a code called arrayRecursiveDiff which handles multidimensional arrays and outputs the difference.
var_dump(arrayRecursiveDiff($array, $bin));
function arrayRecursiveDiff($aArray1, $aArray2) {
$aReturn = array();
foreach ($aArray1 as $mKey => $mValue) {
if (array_key_exists($mKey, $aArray2)) {
if (is_array($mValue)) {
$aRecursiveDiff = arrayRecursiveDiff($mValue, $aArray2[$mKey]);
if (count($aRecursiveDiff)) { $aReturn[$mKey] = $aRecursiveDiff; }
} else {
if ($mValue != $aArray2[$mKey]) {
$aReturn[$mKey] = $mValue;
}
}
} else {
$aReturn[$mKey] = $mValue;
}
}
return $aReturn;
}
This outputs:
array(2) {
[1]=>
array(2) {
["id"]=>
int(1)
["description"]=>
string(3) "Bag"
}
[2]=>
array(1) {
["description"]=>
string(6) "Pencil"
}
}

Answer 3

You can use this.Nevertheless both arrays have different length or the values do not have the same position, This will work :
$bin_desc=array_column($bin,'description');
$b = array_map(function($array)use($bin_desc) {
if (in_array($array['description'],$bin_desc)){
$count = "found";
}else{
$count = "not found";
}
return array("status" => $count, "cart_array" => $array['description'], "bin"=>$array['description']); }, $array);
var_dump($b);