Remove items with certain keys from array

Question

I have an array that looks like this:

$arr = [
    0 => "A",
    1 => "B",
    2 => "C",
    3 => "D",
    4 => "E",
];

And I want to delete few of the items, I have array of their keys:

$delKeys = [0,2,3];

The following procedure shows what I want to achieve:

foreach ($delKeys as $dk) {
    unset($arr[$dk]);
}

I'm left with:

array(
    [1] => "B",
    [4] => "E",
)

Is there a build in method that does the above 3-liner, like array_filter, but preserving the keys of the original array?

So what would be the expected output? If you want to preserve the keys?! — Rizier123
– Rizier123, Commented Mar 26, 2015 at 13:20
The above foreach works perfectly fine and I've shown the expected output with preserved keys. I'm wondering if there is build-in function that does the same. array_filter does it but it resets the keys (it generates new array with the non-filtered items). — ddinchev
– ddinchev, Commented Mar 26, 2015 at 13:21

user3942918 · Accepted Answer · 2015-03-26 13:24:46Z

7

Two functions, but one line at least - array_diff_key() along with array_flip():

array_diff_key($arr, array_flip($delKeys))

Array
(
    [1] => B
    [4] => E
)

answered Mar 26, 2015 at 13:24

user3942918

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1 Comment

ddinchev Over a year ago

Thanks, does exactly what I want.

Navneet Garg · Accepted Answer · 2015-03-26 14:51:55Z

0

array_diff_key($arr, array_flip($delKeys))

array_flip function will flip values in to keys and than array_diff_key find the difference between both the arrays

answered Mar 26, 2015 at 14:51

Navneet Garg

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3 Comments

Rizier123 Over a year ago

This is just a complete copy of this answer: stackoverflow.com/a/29279629/3933332

Navneet Garg Over a year ago

yes but provide explanation what actually happen using those functions

ddinchev Over a year ago

Well, I think it's pretty clear, but you can edit other's answers to add descriptions.

Martin Bean · Accepted Answer · 2015-03-26 13:45:22Z

-3

You could always define your own function for this task:

/**
 * Remove the specified keys from a given array.
 *
 * @param  array $array
 * @param  array $keys
 * @return array
 */
function array_forget(array $array, array $keys)
{
    foreach ($keys as $key)
    {
        unset($array[$key]);
    }

    return $array;
}

Usage:

$arr = array_forget($arr, [0,2,3]);

edited Mar 26, 2015 at 13:45

answered Mar 26, 2015 at 13:30

Martin Bean

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3 Comments

PeeHaa Over a year ago

Haven't you heard @PaulCrovella. Laravel is great and does all the things!

Martin Bean Over a year ago

@PaulCrovella I meant the function was more based on the one Laravel defined for this task rather than, “Laravel defines functions, so therefore that’s the way to go!”

Martin Bean Over a year ago

@PeeHaa See previous comment.

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