What are some common methods for extracting parameters from URLs in PHP?

When working with URLs in PHP, it is common to need to extract parameters from the URL in order to process them in your code. One common method for extracting parameters from URLs in PHP is using the $_GET superglobal array, which contains key-value pairs of parameters passed in the URL query string. Another method is using the parse_url function to parse the URL and extract specific components such as the query string. Additionally, regular expressions can be used to extract parameters from URLs based on a specific pattern. 

// Using $_GET superglobal array to extract parameters from URL
if(isset($_GET['param1'])) {
    $param1 = $_GET['param1'];
}

// Using parse_url function to extract query string parameters from URL
$url = "http://example.com/page?param1=value1&param2=value2";
$queryString = parse_url($url, PHP_URL_QUERY);
parse_str($queryString, $params);
$param1 = $params['param1'];

// Using regular expressions to extract parameters from URL
$url = "http://example.com/page?param1=value1&param2=value2";
preg_match('/param1=([^&]*)/', $url, $matches);
$param1 = $matches[1];

Keywords

PHP URL parameters $_GET parse_url parse_str

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