remove array from array if key, value not exist - php

Question

I have an array in an array in an array. How can I search if any of these arrays have a specific key and value? If not remove this array from array.
Example:
array:3 [▼
0 => array:2 [▼
"location" => array:4 [▶]
"promotions" => array:1 [▶]
]
1 => array:2 [▼
"city" => array:4 [▶]
"promotions" => array:2 [▼
0 => array:5 [▶]
1 => array:5 [▼
"distance" => "0.2288511878121104"
"promoid" => 54
"promo" => Promotion {#1259 ▶}
"product" => Products {#1162 ▶}
"productID" => 5
]
]
]
2 => array:2 [▼
"city" => array:4 [▶]
"promotions" => []
]
]
I want to search "productID" with value 5, and I want to remove array in promotions which doesn`t have this value.
SOLVED
foreach ($locations as $key => $location) {
foreach ($location['promotions'] as $item => $promotions) {
if (is_array($promotions)) {
foreach ($promotions as $k => $value) {
if (!is_array($value)) {
if ($k == 'productID' && $value != $id) {
unset($locations[$key]['promotions'][$item]);
}
}
}
}
}
}

Answer 1

You could use a recursive function and unset() the target
<?php
// example code
$a = [
'test' => 'foo',
'bar' => [
'productID' => 5,
'something' => 'else'
],
'bar2' => [
'productID' => 6,
'something2' => 'else'
]
];
function removeItem($array, $search) {
$s = explode(":",$search);
$skey = trim($s[0]);
$sval = trim($s[1]);
foreach ($array as $n => $v) {
if ($n == $skey && $v == $sval) {
unset($array[$n]);
} else {
if (is_array($v)) $v = removeItem($v, $search);
$array[$n] = $v;
}
}
return $array;
}
$a = removeItem($a, 'productID:5');
print_r($a);
example: https://www.tehplayground.com/zJ2bKplP1pDaV8Ss

Answer 2

Nice solve, you can skip the 3er loop, checking if the key is set with isset()
foreach ($arr as $key => $location) {
if (!is_array($location)) { //if child is not an array ignore it
continue;
}
foreach ($location as $item => $promotions) {
if (!is_array($location)) {//if child is not an array ignore it
continue;
}
if (
isset($promotions['productID']) && //3er lvl, Has the key?
$promotions['productID'] == $id //Has the id
) {
continue; //This is a match so, ignore it
} else {
unset($arr[$key][$item]); //This promotion doesn't have it.
}
}
}
And this one checks at all levels, it uses recursive fn
$ans = deepClean($arr, 'productID', 5);
function deepClean($arr, $search_key, $search_value): ?array
{
if (
isset($arr[$search_key]) && //Has the key
$arr[$search_key] == $search_value //Match value
) {
return $arr;
}
//check children
$currentLevel = [];
foreach ($arr as $key => $value) {
if (!is_array($value)) {
continue;
}
$deepArr = deepClean($value, $search_key, $search_value);
if (is_array($deepArr)) { //child has search?
$currentLevel[$key] = $deepArr;
}
}
return $currentLevel === [] ? null : $currentLevel;
}