Get URL query string parameters

Question

What is the \"less code needed\" way to get parameters from a URL query string which is formatted like the following?

www.mysite.com/category/subcateg

Answer 1

The function parse_str() automatically reads all query parameters into an array.

For example, if the URL is http://www.example.com/page.php?x=100&y=200, the code

$queries = array();
parse_str($_SERVER['QUERY_STRING'], $queries);

will store parameters into the $queries array ($queries['x']=100, $queries['y']=200).

Look at documentation of parse_str

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EDIT

According to the PHP documentation, parse_str() should only be used with a second parameter. Using parse_str($_SERVER['QUERY_STRING']) on this URL will create variables $x and $y, which makes the code vulnerable to attacks such as http://www.example.com/page.php?authenticated=1.

Answer 2

Thanks to @K. Shahzad This helps when you want the rewrited query string without any rewrite additions. Let say you rewrite the /test/?x=y to index.php?q=test&x=y and you want only want the query string.

function get_query_string(){

    $arr = explode("?",$_SERVER['REQUEST_URI']);
    if (count($arr) == 2){
        return "";
    }else{
        return "?".end($arr)."<br>";
    }       
}
$query_string = get_query_string();

Answer 3

If you want the whole query string:

$_SERVER["QUERY_STRING"]

Answer 4

For getting each node in the URI, you can use function explode() to $_SERVER['REQUEST_URI']. If you want to get strings without knowing if it is passed or not. you may use the function I defined myself to get query parameters from $_REQUEST (as it works both for POST and GET params).

function getv($key, $default = '', $data_type = '')
{
    $param = (isset($_REQUEST[$key]) ? $_REQUEST[$key] : $default);

    if (!is_array($param) && $data_type == 'int') {
        $param = intval($param);
    }

    return $param;
}

There might be some cases when we want to get query parameters converted into Integer type, so I added the third parameter to this function.

Answer 5

I will recommended best answer as

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

Assuming the user entered http://example.com/?name=Hannes

The above example will output:

Hello Hannes!

Answer 6

$_SERVER['QUERY_STRING'] contains the data that you are looking for.

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DOCUMENTATION

• php.net: $_SERVER - Manual