PHP中 函数parse_url用法

$url = "http://www.electrictoolbox.com/php-extract-domain-from-full-url/"; 
$parts = parse_url($url);

Array ( 
[scheme] => http 
[host] => www.electrictoolbox.com 
[path] => /php-extract-domain-from-full-url/ 
)

<?php $url = &#39;http://username:password@hostname/path?arg=value#anchor&#39;; 
print_r(parse_url($url)); 
echo parse_url($url, PHP_URL_PATH); 
?>

Array ( 
[scheme] => http 
[host] => hostname 
[user] => username 
[pass] => password 
[path] => /path 
[query] => arg=value 
[fragment] => anchor 
)

echo parse_url($url, PHP_URL_PATH);

PHP_URL_SCHEME, PHP_URL_HOST, PHP_URL_PORT, PHP_URL_USER, PHP_URL_PASS, PHP_URL_PATH, PHP_URL_QUERY or PHP_URL_FRAGMENT.