Given an associative array:
array("key1" => "value1", "key2" => "value2", ...)
How would I go about removing a certain key-value pair, given the key?
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7 Answers
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
(
)
4 Comments
FreeAsInBeer
+1: Thanks for the help. PHP newb here, but it's worth noting that if you are trying to perform these edits inside of a
foreach loop, then you need to prepend an ampersand to your enumeration variable to allow write access.
DanimalReks
Here is a link to a solution that illustrates the comment by @FreeAsInBeer link with respect to the ampersand.
Urasquirrel
Is this destructive of the original array? Is there a clean functional paradigm way to do this that produces an entirely new array without the value?
Vineet Sajwan
What is the best approach for case insensitivity (key1, Key1, KEY1 etc.)?
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']
3 Comments
Abraham Brookes
you need to close your quotes on
$output = array_except($array_1, ['color', 'fixed']);Urasquirrel
plus one! functional!
Sahil Kashyap
I needed reverse functionality, is there in built functionality?
php function array_extract($array, $keys) { return array_intersect_key($array, array_flip((array) $keys)); } $output = array_extract($array, ['color', 'fixed']); print_r($output); //Array ( [color] => red [fixed] => 1 ); 
Comments
Using unset:
unset($array['key1'])
Comments
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
Comments
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]
Comments
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]);
}
}
