How to save specific items from array using array keys.
INPUT:
$arr = [
0 => 'item0',
2 => 'item2',
4 => 'item4',
43 => 'item43'
];
Now I only want to save keys 2 and 43.
Expected Output:
$arr = [
2 => 'item2',
43 => 'item43'
];
Current Code:
foreach ($arr as $key => $value) {
if(!($key == 2 || $key == 43)) {
unset($arr[$key]);
}
}
It works for now, but what if i have more array keys to save.
You can try this one. Here we are using array_intersect_key and array_flip
array_intersect_keyComputes the intersection of arrays using keys.
array_flipwill flip array over keys and values.
<?php
ini_set('display_errors', 1);
$arr = [
0 => 'item0',
2 => 'item2',
4 => 'item4',
43 => 'item43'
];
$keys= [
2,
43
];
$result=array_intersect_key($arr, array_flip($keys));
print_r($result);
Solution for current code try here.
You should use != and with && instead of ||
foreach ($arr as $key => $value)
{
if($key != 2 && $key != 43)
{
unset($arr[$key]);
}
}
print_r($arr);
try this code
<?PHP
$mykeys=array(2,5,9,7,3,4);
foreach ($arr as $key => $value) {
if(!(in_array($key,$mykeys) {
unset($arr[$key]);
}
}?>
you can put the keys you want to keep in an array then iterate over it like this:
$keys = array(); // put the keys here
foreach ( $arr as $key => $value) {
$found = 0;
foreach($keys as $filterKey) {
if ($key == $filterKey) {
$found = 1;
break;
}
$found = 0;
}
if ($found == 0) {
unset($arr[$key]);
}
}
