PHP - Delete from multi-dimensional array by value [closed]

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I have a multi-dimensional PHP array and want to remove any elements (on a row basis) which do not match a value.

For example:

$user_types = [
    0 => ['ut_id' => 32, 'type' => 'admin'],
    1 => ['ut_id' => 31, 'type' => 'user'],
    2 => ['ut_id' => 801, 'type' => 'editor']
];

Let's say I only want the element where 'type' == 'admin'. I want the output to be:

$user_types = [
     0 => ['ut_id' => 32, 'type' => 'admin']
]

I also need to ensure that the array is keyed sequentially. So if I only want type == 'editor' the array key should still be 0 (not 2), e.g.

 $user_types = [
     0 => ['ut_id' => 801, 'type' => 'editor']
 ]

I've had a look at PHP array delete by value (not key) but this does not deal with multi-dimensional arrays.

I've also seen some solutions which use a foreach loop, but that seems quite inefficient.

Please can someone point me in the direction of what to look at? I can't find any examples that deal with this when it comes to multidimensional arrays. I have seen Delete element from multidimensional-array based on value but this seems inefficient and was written about 6 years ago.

I would look into multi-dimensional array searches and go from there. I will note that numerically indexed arrays always start at 0. You can't have a single element with a key of 2. — Stuart Wagner
– Stuart Wagner, Commented Feb 6, 2017 at 10:05
php.net/manual/en/function.array-filter.php in combination with array_values. — jeroen
– jeroen, Commented Feb 6, 2017 at 10:05
@StuartWagner Yes you can, there is no such restriction on the array key in php. — jeroen
– jeroen, Commented Feb 6, 2017 at 10:06

arkascha · Accepted Answer · 2017-02-06 10:10:25Z

3

You can use php's array_filter() function here:

<?php
$user_types = [
    0 => ['ut_id' => 32, 'type' => 'admin'],
    1 => ['ut_id' => 31, 'type' => 'user'],
    2 => ['ut_id' => 801, 'type' => 'editor']
];

$type = 'admin';
print_r(
    array_values(
        array_filter($user_types, function($entry) use ($type){
            return $entry['type'] === $type;
        })
    )
);

$type = 'editor';
print_r(
    array_values(
        array_filter($user_types, function($entry) use ($type){
            return $entry['type'] === $type;
        })
    )
);

The output of above code is:

Array
(
    [0] => Array
        (
            [ut_id] => 32
            [type] => admin
        )

)
Array
(
    [0] => Array
        (
            [ut_id] => 801
            [type] => editor
        )

)

answered Feb 6, 2017 at 10:10

arkascha

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1 Comment

Andy Over a year ago

Works perfectly and very efficient, Thank you. Will accept as the answer in a few mins when SO allows me to :)

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