Return all array elements except for a given key

Question

Simple one, I was just wondering if there is a clean and eloquent way of returning all values from an associative array that do not match a given key(s)?

$array          


        

Answer 1

array_diff_assoc could help. So i.e. you could use

$onlyBeta = array_diff_assoc($array, array('alpha', 'gamma'))

Answer 2

Use array_diff_key():

$array = array('alpha' => 'apple', 'beta' => 'banana', 'gamma' => 'guava');

$alphaAndGamma = array_diff_key($array, array('alpha'=>0));
$onlyBeta      = array_diff_key($array, array('alpha'=>0, 'gamma'=>0));

EDIT: I added =>0s.

Answer 3

$alphaAndGamma = $array;
unset($alphaAndGamma['alpha']);

$onlyBeta = $array;
unset($onlyBeta['alpha'], $onlyBeta['gamma']);

Answer 4

Although, this question is too old and there are several answer are there for this question, but I am posting a solution that might be useful to someone.

You may get the all array elements from provided input except the certain keys you've defined to exclude using:

$result = array_diff_key($input, array_flip(["SomeKey1", "SomeKey2", "SomeKey3"]));

This will exclude the elements from $input array having keys SomeKey1, SomeKey2 and SomeKey3 and return all others into $result variable.

Answer 5

You could just unset the value:

$alphaAndGamma = $array;
unset($alphaAndGamma['alpha']);

Edit: Made it clearer. You can copy an array by assigning it to another variable.

or in a function:

function arrayExclude($array, Array $excludeKeys){
    foreach($excludeKeys as $key){
        unset($array[$key]);
    }
    return $array;
}

Answer 6

There have been a few discussions about speed when using in_array. From what I've read, including this comment1, using isset is faster than in_array.

In that case your code would be:

function arrayExclude($array, array $excludeKeys){

    $return = [];

    foreach($array as $key => $value){
        if(!isset($excludeKeys[$key])){
            $return[$key] = $value;
        }
    }
    return $return;
}

That would be slightly faster, and may help in the event that you're needing to process large datasets.