What potential issues can arise when using special characters like '&' in URL parameters in PHP?

Special characters like '&' in URL parameters can cause issues because they are reserved characters in URLs and can be misinterpreted by the server. To solve this problem, you can use the urlencode() function in PHP to encode the special characters before appending them to the URL. 

$param1 = urlencode('value with & symbol');
$param2 = urlencode('another value');

$url = "http://example.com/api?param1=$param1&param2=$param2";

// Use $url in your request

Keywords

URL encoding htmlspecialchars XSS attacks urlencode query string.

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