Removing an element from an array (PHP)

Question

I want to remove an element from a PHP array (and shrink the array size). Just looking at the PHP docs, it seems this can be done using array_slice() and array_merge()

so I am guessing (off the top of my head) that some combination of array_merge() and array_slice will work. However, array_slice() requires an index (not a key), so I'm not sure how to quickly cobble these functions together for a solution.

Has anyone implemented such a function before?. I'm sure it must be only a few lines long, but I cant somehow get my head around it (its been one of those days) ...

Actually, I just came up with this cheesy hack when writing up this question....

function remove_from_array(array $in, value) {
   return array_diff($in, (array)$value);
}

too ugly? or will it work (without any shocking side effects)?

mmattax · Accepted Answer · 2010-05-11 16:22:37Z

6

This functionality already exists; take a look at unset.

http://php.net/manual/en/function.unset.php


$a = array('foo' => 'bar', 'bar' => 'gork');
unset($a['bar']);
print_r($a);

output will be:

array(
[foo] => bar
)

edited May 11, 2010 at 16:22

answered May 11, 2010 at 16:13

mmattax

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1 Comment

jscripter Over a year ago

what if it's indexed by numbers?

amphetamachine · Accepted Answer · 2010-05-11 16:14:47Z

1

There's the array_filter function that uses a callback function to select only wanted values from the array.

answered May 11, 2010 at 16:14

amphetamachine

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Comments

Elzo Valugi · Accepted Answer · 2010-05-11 16:18:40Z

1

you want an unset by value. loop through the array and unset the key by value.

answered May 11, 2010 at 16:18

Elzo Valugi

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Jakub Hampl · Accepted Answer · 2010-05-11 16:16:03Z

0

unset($my_array['element']);

Won't work?

answered May 11, 2010 at 16:16

Jakub Hampl

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4 Comments

Ja͢ck Over a year ago

This is really a comment, not an answer to the question. Please use "add comment" to leave feedback for the author.

Jakub Hampl Over a year ago

@Jack Why do you think it is a comment?

Ja͢ck Over a year ago

Because it looks like one? Surely you could have spent a few more seconds to make it a proper answer.

Jakub Hampl Over a year ago

AFAIK it answers the question fully and correctly, no need to add extra garbage to the answer.

Vadym · Accepted Answer · 2010-05-11 16:16:18Z

0

This code can be replaced by single array_filter($arr) call

answered May 11, 2010 at 16:16

Vadym

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Comments

Matt · Accepted Answer · 2010-05-11 16:20:39Z

0

foreach($array as $key => $value) {
    if($value == "" || $value == " " || is_null($value)) {
        unset($array[$key]);
    }
}

/*
and if you want to create a new array with the keys reordered accordingly...
*/
$new_array = array_values($array);

edited May 11, 2010 at 16:20

Matt

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answered May 11, 2010 at 16:13

user284295

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1 Comment

mmattax Over a year ago

FYI - Your if statement can be improved a bit if you would use php's empty() functionality.

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