The 7th Annual China PHP Conference

$_GET

$HTTP_GET_VARS [Obsolète]

(PHP 4 >= 4.1.0, PHP 5, PHP 7)

$_GET -- $HTTP_GET_VARS [Obsolète]Variables HTTP GET

Description

Un tableau associatif des valeurs passées au script courant via les paramètres d'URL (aussi connue sous le nom de "query string"). Notez que ce tableau n'est pas seulement rempli pour les requêtes GET, mais plutôt pour toutes les requêtes avec un query string.

$HTTP_GET_VARS contient les mêmes informations, mais n'est pas superglobale. (Notez que $HTTP_GET_VARS et $_GET sont des variables différentes et que PHP les traite comme telles.)

Exemples

Exemple #1 Exemple avec $_GET

<?php
echo 'Bonjour ' htmlspecialchars($_GET["name"]) . '!';
?>

En assumant que l'utilisateur a entré http://example.com/?name=Yannick

L'exemple ci-dessus va afficher quelque chose de similaire à :

Bonjour Yannick!

Notes

Note:

Ceci est une 'superglobale', ou variable globale automatique. Cela signifie simplement que cette variable est disponible dans tous les contextes du script. Il n'est pas nécessaire de faire global $variable; pour y accéder dans les fonctions ou les méthodes.

Note:

Les variables GET sont passées via urldecode().

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User Contributed Notes 4 notes

up
205
John Galt
9 years ago
Just a note, because I didn't know for sure until I tested it.

If you have a query string that contains a parameter but no value (not even an equals sign), like so:
http://path/to/script.php?a

The following script is a good test to determine how a is valued:
<pre>
<?php
print_r
($_GET);
if(
$_GET["a"] === "") echo "a is an empty string\n";
if(
$_GET["a"] === false) echo "a is false\n";
if(
$_GET["a"] === null) echo "a is null\n";
if(isset(
$_GET["a"])) echo "a is set\n";
if(!empty(
$_GET["a"])) echo "a is not empty";
?>
</pre>

I tested this with script.php?a, and it returned:

a is an empty string
a is set

So note that a parameter with no value associated with, even without an equals sign, is considered to be an empty string (""), isset() returns true for it, and it is considered empty, but not false or null. Seems obvious after the first test, but I just had to make sure.

Of course, if I do not include it in my browser query, the script returns
Array
(
)
a is null
up
10
timberspine _AT_ gmail _DOT_ com
11 years ago
Note that named anchors are not part of the query string and are never submitted by the browser to the server.

Eg.
http://www.xyz-abc.kz/index.php?title=apocalypse.php#doom

echo $_GET['title'];

// returns "apocalypse.php" and NOT "apocalypse.php#doom"

you would be better off treating the named anchor as another query string variable like so:
http://www.xyz-abc.kz/index.php?title=apocalypse.php&na=doom

...and then retrieve it using something like this:
$url = $_GET['title']."#".$_GET['na'];

Hope this helps someone...
up
3
chris at bjelleklang dot org
8 years ago
Please note that PHP setups with the suhosin patch installed will have a default limit of 512 characters for get parameters. Although bad practice, most browsers (including IE) supports URLs up to around 2000 characters, while Apache has a default of 8000.

To add support for long parameters with suhosin, add
suhosin.get.max_value_length = <limit> in php.ini
up
-6
whatchildisthis
9 months ago
The variable name $_GET is a bit misleading. It works with any HTTP request method that has a query component in the URI: GET, POST, PUT, PATCH, DELETE. A better name would be $_QUERY, similar to http_build_query and PHP_URL_QUERY in parse_url.
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