How to Retrieve Multiple Parameters with the Same Name from a URL in PHP?

Retrieving Multiple Parameters with the Same Name from a URL in PHP

In web applications, URLs often contain multiple parameters to pass information to the PHP script. However, PHP's $_GET function typically returns only the last value for a given parameter. This can be problematic when multiple parameters with the same name are present in the URL.

Consider this example URL:

http://example.com/index.php?param1=value1&param2=value2&param1=value3

In this case, $_GET['param1'] would return "value3," overwriting the earlier value ("value1").

To handle this issue, the following code snippet can be used:

$query = explode('&', $_SERVER['QUERY_STRING']);
$params = array();

foreach ($query as $param) {
    // To prevent errors, ensure each element has an equals sign.
    if (strpos($param, '=') === false) {
        $param .= '=';
    }

    list($name, $value) = explode('=', $param, 2);
    $params[urldecode($name)][] = urldecode($value);
}

This code will create an associative array where each key corresponds to a parameter name, and each value is an array containing all the values associated with that parameter. For the example URL above, the resulting $params array would be:

array(
    'param1' => array('value1', 'value3'),
    'param2' => array('value2')
)

By using this method, you can easily access all values associated with each parameter from the URL, regardless of whether the parameters occur multiple times.

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