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Manual: array_keys
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array_keys

(PHP4 )

array_keys -- Retourne toutes les clés d'un tableau

Description

array array_keys (array input [, mixed search_value])

array_keys() retourne les clés numériques et litérales du tableau input.

Si l'option search_value est spécifiée, seule les clés ayant cette valeur seront retournées. Sinon, toutes les clés de input sont retournées.

Exemple 1. Exemple avec array_keys()


$array = array(0 => 100, "couleur" => "rouge");
array_keys ($array);       // retourne array (0, "couleur")

$array = array(1, 100, 2, 100);
array_keys ($array, 100);  //  retourne array (0, 2)

Voir aussi array_values().

Note: Cette fonction a été ajoutée dans PHP 4.0.


User Contributed Notes: array_keys

david@audiogalaxy.com
30-Jan-2000 08:53
Are array_keys() and array_values() guaranteed to list elements from an input array in the same order?

vraravam@thoughtworks.com
14-Jul-2000 05:25
I am desperately trying to find a corresponding function for array_keys() in PHP3. I am using version 3.1.16. If anybody knows any such function/method, please email me at
vraravam@thoughtworks.com

Thanks in advance

scott@cyberwar.com
15-Jul-2000 02:39
Below is a function that I wrote that acts the same as array_keys, but works in PHP3:


<pre>
function array_keys ($x) {
for($i=0;$i&#60;count($x);$i++) {
$y=each($x);
$z[$i]=$y[0];
}
return $z;
}
</pre>

marksg@chello.nl
13-Aug-2000 12:26
In the above example, they say:
If the optional search_value is specified, then only the keys for that value are returned. Otherwise, all the keys from the input are returned.

$array = array (1, 100, 2, 100);
array_keys ($array, 100); // returns array (0, 2)

should the return then be: array (1, 3) in stead of: array (0, 2) ??

 About Notes

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