How does php parse url? Introduction to 5 ways to parse URLs

Several ways for PHP to parse URLs

##1. Use the $_SERVER built-in array variable

Visit:

http://localhost/test.php?m=admin&c=index&a=lists&catid=1&page=1

//URL的参数
echo $_SERVER['QUERY_STRING'];
返回：
m=admin&c=index&a=lists&catid=1&page=1
//包含文件名
echo $_SERVER["REQUEST_URI"];

/test.php?m=admin&c=index&a=lists&catid=1&page=1

2. Use the pathinfo built-in function

echo "
";
$url = 'http://localhost/test.php?m=admin&c=index&a=lists&catid=1&page=1#top';
var_export(pathinfo($url));
 Return: 
array (
  'dirname' => 'http://localhost',
  'basename' => 'test.php?m=admin&c=index&a=lists&catid=1&page=1#top',
  'extension' => 'php?m=admin&c=index&a=lists&catid=1&page=1#top',
  'filename' => 'test',
)

3. Use the parse_url built-in function 
echo "
";
$url = 'http://localhost/test.php?m=admin&c=index&a=lists&catid=1&page=1#top';
var_export(parse_url($url));
Return: 
array (
  'scheme' => 'http',
  'host' => 'localhost',
  'path' => '/test.php',
  'query' => 'm=admin&c=index&a=lists&catid=1&page=1',
  'fragment' => 'top',
)

4. Use basename built-in function 
echo "
";
$url = 'http://localhost/test.php?m=admin&c=index&a=lists&catid=1&page=1#top';
var_export(basename($url));
Return: 
test.php?m=admin&c=index&a=lists&catid=1&page=1#top

5. Regular matching 
echo "
";
$url = 'http://localhost/test.php?m=admin&c=index&a=lists&catid=1&page=1#top';
preg_match_all("/(\w+=\w+)(#\w+)?/i",$url,$match);
var_export($match);
 Returns: 
array (
  0 => 
  array (
    0 => 'm=admin',
    1 => 'c=index',
    2 => 'a=lists',
    3 => 'catid=1',
    4 => 'page=1#top',
  ),
  1 => 
  array (
    0 => 'm=admin',
    1 => 'c=index',
    2 => 'a=lists',
    3 => 'catid=1',
    4 => 'page=1',
  ),
  2 => 
  array (
    0 => '',
    1 => '',
    2 => '',
    3 => '',
    4 => '#top',
  ),
)

Common url processing methods
/**
 * 将字符串参数变为数组
 * @param $query
 * @return array
 */
function convertUrlQuery($query)
{
    $queryParts = explode('&', $query);
    $params = array();
    foreach ($queryParts as $param) {
        $item = explode('=', $param);
        $params[$item[0]] = $item[1];
    }
    return $params;
}

/**
 * 将参数变为字符串
 * @param $array_query
 * @return string
 */
function getUrlQuery($array_query)
{
    $tmp = array();
    foreach ($array_query as $k => $param) {
        $tmp[] = $k . '=' . $param;
    }
    $params = implode('&', $tmp);
    return $params;
}
Example:

echo "
";
$url = 'http://localhost/test.php?m=admin&c=index&a=lists&catid=1&page=1#top';
$arr = parse_url($url);
$arr_query = convertUrlQuery($arr['query']);
var_export($arr_query);
 Return: 

array (
  'm' => 'admin',
  'c' => 'index',
  'a' => 'lists',
  'catid' => '1',
  'page' => '1',
)
var_export(getUrlQuery($arr_query));
 Return: 

m=admin&c=index&a=lists&catid=1&page=1
 Recommended related tutorials: "
PHP Tutorial"
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