How to replace array key by its value

Question

I have the following array:

array('Elnett', 'INOA INOA', 'Playball P', 'Preferred Color Specialist', 
      'Série Expert', 'Série Nature', 'Techni art')

I would like to have keys and values like:

array('Elnett' => 'Elnett', 
      'INOA INOA' => 'INOA INOA', 
      'Playball P' => 'Playball', 
      'Preferred Color Specialis' => 'Preferred Color Specialist', 
      'Série Expert' => 'Série Expert', 
      'Série Nature' => 'Série Nature', 
      'Techni art' => 'Techni art')

How can I accomplish this?

Note you can format lines as code by indenting them four spaces. The "{}" button in the editor toolbar does this for you. If you want to preserve whitespace (indentation and new lines) for text that isn't code (such as the sample arrays), use <pre> elements. Edit your question and try it out. Click the orange question mark in the editor toolbar for more information and tips on formatting. — outis
– outis, Commented May 31, 2011 at 9:26
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– outis, Commented Jun 1, 2011 at 0:49

rdok · Accepted Answer · 2015-08-01 05:38:36Z

31

There's array_combine to create a key/value array out of two arrays. Should be possible to use the same array for keys and values:

$names = array_combine($names, $names);

edited Aug 1, 2015 at 5:38

rdok

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answered May 31, 2011 at 9:28

GolezTrol

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Comments

Community · Accepted Answer · 2023-11-17 20:33:26Z

10

This one-line answer may be useful to someone.

$trans = array_flip($array);

https://www.php.net/array_flip

array_flip returns the value=>key format of given key=>value array. as the question changed, this does not exactly answer the OP's question anymore.

edited Nov 17, 2023 at 20:33

CommunityBot

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answered Nov 11, 2013 at 16:06

ptvty

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2 Comments

squarecandy Over a year ago

between this and the other answer here you can start with $a = array( 'foo' => 'bar' ) and do (1) array_combine($a, $a) to get array( 'bar' => 'bar' ), (2) array_flip($a) to get array( 'bar' => 'foo' ), (3) array_combine( array_flip($a), array_flip($a) ) to get array( 'foo' => 'foo' )

squarecandy Over a year ago

Just watch out for array_flip when all of your keys are unique, but your values contain duplicates. You will end up with a smaller array than you started with, which may or may not have been your intention.

Gabriel Spiteri · Accepted Answer · 2011-05-31 09:25:22Z

1

Could do something like this. Not sure if there is a cleaner way to do it.

foreach($names as $key => $name){
    $names[$name] = $name;
    unset($names[$key]);
}

answered May 31, 2011 at 9:25

Gabriel Spiteri

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1 Comment

Dzmitry Kulahin Over a year ago

What about this array: array(0, 1, 2) :)

Prof. Falken · Accepted Answer · 2012-07-03 07:21:28Z

-1

foreach($array as $key=>$value){
    $out[$value] = $value;
}

print_r($out);

edited Jul 3, 2012 at 7:21

Prof. Falken

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answered May 31, 2011 at 9:24

konsolenfreddy

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3 Comments

Dzmitry Kulahin Over a year ago

Wrong answer. The first array ($array) was like this: [0=>'Elnett', 1=>'INOA INOA', ...]. After these transformations we get this array ($out): [0=>'Elnett', 1=>'INOA INOA', 'Elnett'=>'Elnett', 'INOA INOA'=>'INOA INOA', ...].

Mash tan Over a year ago

did you even test this code? what happens to the original keys? this will just duplicate your array

konsolenfreddy Over a year ago

As the $out is a fresh array, the original keys are not in there.. you can see the tinker here: onlinephp.io/c/15b84

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