How to get parameters from a URL string in PHP?

In PHP, you can extract parameters from a URL string using the parse_url() function combined with parse_str(). The parse_url() function breaks down a URL into its components, while parse_str() parses the query string into an associative array.

Syntax

parse_url($url, $component)
parse_str($query_string, $result_array)

Basic Example

Here's how to extract specific parameters from a URL ?

<?php
    $url = 'http://www.example.com/register?name=demo&email=example12@domain.com';
    $res = parse_url($url);
    parse_str($res['query'], $params);
    echo 'Email = '.$params['email'];
?>

Email = example12@domain.com

Extracting Multiple Parameters

You can access all parameters from the same URL ?

<?php
    $url = 'http://www.example.com/register?name=demo&email=example12@domain.com';
    $res = parse_url($url);
    parse_str($res['query'], $params);
    
    echo 'Name = '.$params['name']."
";
    echo 'Email = '.$params['email'];
?>

Name = demo
Email = example12@domain.com

Error Handling

Always check if the query component exists to avoid errors ?

<?php
    $url = 'http://www.example.com/page';
    $res = parse_url($url);
    
    if (isset($res['query'])) {
        parse_str($res['query'], $params);
        print_r($params);
    } else {
        echo 'No parameters found in URL';
    }
?>

No parameters found in URL

Conclusion

Use parse_url() and parse_str() together to extract URL parameters in PHP. Always check if the query component exists before parsing to prevent errors when dealing with URLs without parameters.