Last updated: Fri, 03 Jul 2009

filter_var

(PHP 5 >= 5.2.0)

filter_var — Filtre une variable avec un filtre spécifique

Description

mixed filter_var ( mixed $variable [, int $filter= FILTER_DEFAULT [, mixed $options ]] )

Liste de paramètres

variable: Valeur à filtrer.
filter: Identifiant du filtre à utiliser. Par défaut, vaut FILTER_SANITIZE_STRING.
options: Tableau associatif d'options ou des drapeaux. Si le filtre accepte les options, les drapeaux peuvent être fournis dans le champ "flags" du tableau. Pour les fonctions de rappel, le type callback devra être passé.

Valeurs de retour

Retourne les données filtrées, ou FALSE si le filtre échoue.

Exemples

Exemple #1 Exemple avec filter_var()


<?php
var_dump(filter_var('bob@example.com', FILTER_VALIDATE_EMAIL));
var_dump(filter_var('example.com', FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED));
?>

L'exemple ci-dessus va afficher :

string(15) "bob@example.com"
bool(false)

Voir aussi

filter_var_array() - Récupère plusieurs variables et les filtrent
filter_input() - Récupère une variable externe et la filtre
filter_input_array() - Récupère plusieurs valeurs externes et les filtrent
Informations sur le type callback

Gestion des fonctions

filter_var_array

Last updated: Fri, 03 Jul 2009

add a note User Contributed Notes
filter_var

Meska
30-Apr-2009 07:08


Just a little filter to validate IP v4 & v6

This little script display result in function of the query

<?php

$ipv6="2a01:e35:aaa4:6860:a5e7:5ba9:965e:cc93";

$ipv4="82.237.3.3";

$fake = "3342423423";

$ipv4priv = "255.255.255.255";

$ipv6priv = "::1";

echo "<pre>";

echo $ipv4;

echo "<br />";

var_dump(filter_var($ipv4,FILTER_VALIDATE_IP));

echo "<br />";

echo $ipv6;

echo "<br />";

var_dump(filter_var($ipv6,FILTER_VALIDATE_IP));

echo "<br />";

echo $fake;

echo "<br />";

var_dump(filter_var($fake,FILTER_VALIDATE_IP));

echo "<br />";

echo $ipv4priv;

echo "<br/>";

echo "FILTER_VALIDATE_IP, FILTER_FLAG_NO_RES_RANGE";

echo "<br />";

var_dump(filter_var($ipv4priv,FILTER_VALIDATE_IP, FILTER_FLAG_NO_RES_RANGE));

echo "<br />";

echo $ipv4priv;

echo "<br/>";

echo "FILTER_FLAG_NO_PRIV_RANGE";

echo "<br />";

var_dump(filter_var($ipv4priv,FILTER_FLAG_NO_PRIV_RANGE));

echo "<br />";

echo $ipv6priv;

echo "<br/>";

echo "FILTER_FLAG_NO_PRIV_RANGE";

echo "<br />";

var_dump(filter_var($ipv6priv,FILTER_FLAG_NO_PRIV_RANGE));

echo "<br />";

echo $ipv6priv;

echo "<br />";

var_dump(filter_var($ipv6priv,FILTER_VALIDATE_IP));



echo "</pre>";



?>

jon dot bertsch at ucop dot edu
24-Mar-2009 03:49


Here's an actual example of the filter syntax with a flag since there doesn't appear to be a one liner for this anywhere:



'hours' => array('filter'=>FILTER_SANITIZE_NUMBER_FLOAT, 'flags' => FILTER_FLAG_ALLOW_FRACTION, 'options'=> '.')

erick dot papa at gmail dot com
19-Jan-2009 07:05


Some notes on usage: 



http://sn.im/php_filter

dyer85 at gmail dot com
03-Nov-2008 10:00


Note that when using FILTER_VALIDATE_INT along with the FILTER_FLAG_ALLOW_HEX flag, the string "2f", for example, is not validated successfully, because you must use the "0x" prefix, otherwise, it treats the data as base 10.



The range options are also smart enough to recognize when the boundaries are exceeded in different bases.



Here's an example:



<?php



$foo = '256';

$bar = '0x100';

var_dump(validate_int($foo)); // false, too large

var_dump(validate_int($bar)); // false, too large



function validate_int($input)

{

  return filter_var(

    $input,

    FILTER_VALIDATE_INT,



    // We must pass an associative array

    // to include the range check options.

    array(

      'flags'   => FILTER_FLAG_ALLOW_HEX,

      'options' => array('min_range' => 1, 'max_range' => 0xff)

    )

  );

}



?>

visseraj at gmail dot com
28-Aug-2008 05:31


Here are the other possible flags that you can use:

http://us3.php.net/manual/hu/ref.filter.php

dale dot liszka at gmail dot com
09-Jul-2008 05:15


Here is how to use multiple flags (for those who learn better by example, like me):



<?php

echo "|asdf".chr(9).chr(128)."_123|";

echo "\n";

// "bitwise conjunction" means logic OR / bitwise |

echo filter_var("|asdf".chr(9).chr(128)."_123\n|" ,FILTER_SANITIZE_STRING, FILTER_FLAG_STRIP_LOW | FILTER_FLAG_STRIP_HIGH);



/*

Results:

|asdf    �_123|

|asdf_123|

*/

?>

dale dot liszka at gmail dot com
09-Jul-2008 04:54


Using the FILTER_CALLBACK requires an array to be passed as the options:



<?php

function toDash($x){

   return str_replace("_","-",$x);

} 



echo filter_var("asdf_123",FILTER_CALLBACK,array("options"=>"toDash"));

// returns 'asdf-123'

?>

John
26-Jul-2007 07:35


I managed to get this to work with PHP 5.1.6 on CentOS 5 with minor difficulty.



1) Download the PECL filter package

2) Extract the tarball

3) phpize the directory

4) ./configure

5) make

6) filter-0.11.0/logical_filters.c:25:31: error: ext/pcre/php_pcre.h: No such file or directory

7) find / -name php_pcre.h

8) Make sure php-devel is installed

9) Edit filter-0.11.0/logical_filters.c and replace "ext/pcre/php_pcre.h" with the absolute path of php_pcre.h

10) make

11) make install

12) add "extension=filter.so" to php.ini

13) Restart Apache

add a note

Gestion des fonctions

filter_var_array

Last updated: Fri, 03 Jul 2009