Simple URL Standardization that takes a user input URL and attempts to standardize it. If no URL scheme is given, defaults to http, also appends a forward slash if needed.

url_std.php

<?php

function url_std($url) {
	extract(parse_url($url));
	if ($scheme == '') {
		$scheme = 'http';
	}
	$url = $scheme . "://" . $host . $path;
	// Append a forward slash if needed
	if ( !preg_match('|/$|', $url) ) {
		$url .= '/';
	}
    return $url;
}

?>