How can I remove a key and its value from an associative array?
PhpArraysPhp Problem Overview
Given an associative array:
array("key1" => "value1", "key2" => "value2", ...)
How would I go about removing a certain key-value pair, given the key?
Php Solutions
Solution 1 - Php
You can use unset
:
unset($array['key-here']);
Example:
$array = array("key1" => "value1", "key2" => "value2");
print_r($array);
unset($array['key1']);
print_r($array);
unset($array['key2']);
print_r($array);
Output:
Array
(
[key1] => value1
[key2] => value2
)
Array
(
[key2] => value2
)
Array
(
)
Solution 2 - Php
Use unset()
:
unset($array['key1']);
Solution 3 - Php
Use this function to remove specific arrays of keys without modifying the original array:
function array_except($array, $keys) {
return array_diff_key($array, array_flip((array) $keys));
}
First param pass all array, second param set array of keys to remove.
For example:
$array = [
'color' => 'red',
'age' => '130',
'fixed' => true
];
$output = array_except($array, ['color', 'fixed']);
// $output now contains ['age' => '130']
Solution 4 - Php
Using unset
:
unset($array['key1'])
Solution 5 - Php
Consider this array:
$arr = array("key1" => "value1", "key2" => "value2", "key3" => "value3", "key4" => "value4");
-
To remove an element using the array
key
:// To unset an element from array using Key: unset($arr["key2"]); var_dump($arr); // output: array(3) { ["key1"]=> string(6) "value1" ["key3"]=> string(6) "value3" ["key4"]=> string(6) "value4" }
-
To remove element by
value
:// remove an element by value: $arr = array_diff($arr, ["value1"]); var_dump($arr); // output: array(2) { ["key3"]=> string(6) "value3" ["key4"]=> string(6) "value4" }
read more about array_diff: http://php.net/manual/en/function.array-diff.php
-
To remove an element by using
index
:array_splice($arr, 1, 1); var_dump($arr); // array(1) { ["key3"]=> string(6) "value3" }
read more about array_splice: http://php.net/manual/en/function.array-splice.php
Solution 6 - Php
You may need two or more loops depending on your array:
$arr[$key1][$key2][$key3]=$value1; // ....etc
foreach ($arr as $key1 => $values) {
foreach ($values as $key2 => $value) {
unset($arr[$key1][$key2]);
}
}
Solution 7 - Php
you can do it using Laravel helpers:
first helper, method Arr::except:
$array = ['name' => 'Desk', 'price' => 100];
$filtered = Arr::except($array, ['price']);
// ['name' => 'Desk']
second helper: method Arr::pull
$array = ['name' => 'Desk', 'price' => 100];
$name = Arr::pull($array, 'name');
// $name: Desk
// $array: ['price' => 100]