how to remove some of the array keys in php

Question

for example have such a array:

Array
(
    [ID] => 4
    [DATE_CREATE] => 04.10.2013 20:47:52
    [NAME] => BCAA
    [DEPTH_LEVEL] => 1
    [DESCRIPTION] => 
    [SEARCHABLE_CONTENT] => BCAA
    [CODE] => bcaa
    [DETAIL_PICTURE] =>
)

how to remove some of the array keys to eventually receive the following:

Array
(
    [ID] => 4
    [DATE_CREATE] => 04.10.2013 20:47:52
    [NAME] => BCAA
    [DEPTH_LEVEL] => 1
)

Thanks in advance.

He's not asking how they got removed, he wants to remove them and is asking how to do it. — Barmar
– Barmar, Commented Dec 29, 2013 at 10:16
How did you get the result array? Which keys are you trying to remove? (based on what condition?) Can you show us your code? — Amal
– Amal, Commented Dec 29, 2013 at 10:21

Barmar · Accepted Answer · 2013-12-29 10:17:40Z

7

Use unset:

unset($array['DESCRIPTION']);
unset($array['SEARCHABLE_CONTENT'];
... and so on

answered Dec 29, 2013 at 10:17

Barmar

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1 Comment

HamZa Over a year ago

Hmmmm unset($array['DESCRIPTION'], $array['SEARCHABLE_CONTENT'], ...). The same goes for isset(), it supports multiple variables as parameter :)

BlitZ · Accepted Answer · 2013-12-29 10:31:21Z

5

Well, there is a function named array_diff_key():

$result = array_diff_key(
    $array,
    [
        'DESCRIPTION' => 0,
        'SEARCHABLE_CONTENT' => 0,
        'CODE' => 0,
        'DETAIL_PICTURE' => 0
    ]
);

UPDv1:

There is a way, mentioned by @BluePsyduck:

$result = array_diff_key(
    $array,
    array_flip([ 'DESCRIPTION', 'SEARCHABLE_CONTENT', 'CODE', 'DETAIL_PICTURE' ])
);

edited Dec 29, 2013 at 10:31

answered Dec 29, 2013 at 10:18

BlitZ

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Comments

Danny · Accepted Answer · 2013-12-29 10:19:20Z

3

Just use array_slice function, its perfect for this situation.

$sliced = array_slice($input, 0, 3);

answered Dec 29, 2013 at 10:19

Danny

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Comments

HamZa · Accepted Answer · 2013-12-29 10:21:33Z

3

Use unset().

unset($array['SEARCHABLE_CONTENT']);

In this way unset the keys you don't need.

edited Dec 29, 2013 at 10:21

HamZa

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answered Dec 29, 2013 at 10:18

chanchal118

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Comments

Community · Accepted Answer · 2023-11-17 19:55:19Z

3

Make use of array_slice , You don't need to unset the keys here as you are assigning the array returned from your array_slice() directly to your same array.

<?php
$arr=Array
(
    'ID' => 4,
    'DATE_CREATE' => '04.10.2013 20:47:52',
    'NAME' => 'BCAA',
    'DEPTH_LEVEL' => 1,
    'DESCRIPTION' => NULL,
    'SEARCHABLE_CONTENT' => 'BCAA',
    'CODE' => 'bcaa',
    'DETAIL_PICTURE' => ''
);
$arr = array_slice($arr, 0, 4);

print_r($arr);

OUTPUT:

Array
(
    [ID] => 4
    [DATE_CREATE] => 04.10.2013 20:47:52
    [NAME] => BCAA
    [DEPTH_LEVEL] => 1
)

edited Nov 17, 2023 at 19:55

CommunityBot

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answered Dec 29, 2013 at 10:17

Shankar Narayana Damodaran

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Comments

sergio · Accepted Answer · 2013-12-29 10:18:27Z

2

To remove from array some value by key just:

  $someKey= array_search('someKey', $array);
    unset($array[$someKey]);

Or just:

 unset($array[$someKey])

For example :

unset($array['DESCRIPTION']);
unset($array['SEARCHABLE_CONTENT'];

Or in your case:

$result = array_slice($input, 0, 3);

answered Dec 29, 2013 at 10:18

sergio

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Comments

BluePsyduck · Accepted Answer · 2013-12-29 10:21:27Z

1

If you want to define the keys to be removed, you may use this:

$array = array('foo' => 'bar', 'hello' => 'world', 'blue' => 'psyduck', 'abc' => 'def');
$reducedArray = array_diff_key($array, array_flip(array('blue', 'abc')));

If you want to define the keys to be kept, you may use this:

$array = array('foo' => 'bar', 'hello' => 'world', 'blue' => 'psyduck', 'abc' => 'def');
$reducedArray = array_intersect_key($array, array_flip(array('foo', 'hello')));

In both examples, the resulting array is:

var_dump($reducedArray);
// array(2) { ["foo"]=> string(3) "bar" ["hello"]=> string(5) "world" }

answered Dec 29, 2013 at 10:21

BluePsyduck

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