I have an array like this:
$arr = [
['id' => 12, 'name' => 'Martin', 'cellphone' => '0019949437'],
['id' => 15, 'name' => 'Alex', 'cellphone' => "00183847394"]
];
I need to remove the cellphone item from array above. I wrote an code to do that like this:
$res = array_filter($arr, function($arr){ unset($arr['cellphone']); return $arr; });
But still that item exists and the $res is the same as $arr. What's wrong? What unset doesn't happen?
Filters elements of an array using a callback function
Since you're trying to alter the nested array, array_filter wont work.
Use a loop, something like a foreach() or array_walk() should be fine.
<?php
// Input
$arr = [
['id' => 12, 'name' => 'Martin', 'cellphone' => '0019949437'],
['id' => 15, 'name' => 'Alex', 'cellphone' => "00183847394"]
];
// Using foreach
foreach($arr as &$tmp) {
unset($tmp['cellphone']);
}
// Same result, using array_map
array_walk($arr, function (&$tmp) { unset($tmp['cellphone']); });
// Show result
var_dump($arr);
Here we loop over $arr, use & to get the reference to the deeper array, and use unset() to remove the cellphone.
Result:
array(2) {
[0]=>
array(2) {
["id"]=>
int(12)
["name"]=>
string(6) "Martin"
}
[1]=>
&array(2) {
["id"]=>
int(15)
["name"]=>
string(4) "Alex"
}
}
Using array_map : It returns an array containing the results of applying the callback
$arr = [
['id' => 12, 'name' => 'Martin', 'cellphone' => '0019949437'],
['id' => 15, 'name' => 'Alex', 'cellphone' => "00183847394"]
];
function unsetCellPhone($u){
unset($u['cellphone']);
return $u;
}
$res = array_map("unsetCellPhone", $arr);
print_r($res);
array_filterfor this to begin with, this would be much more a use case forarray_walk.unsetwon't work since$arrisn't a ref to the real array. Use a loop.array_filterwould be to completely remove items from$arr- that is not what you want to do to begin with, you want to modify the items.