Detailed explanation of the definition and usage of php parse_url() function

What is the function of php parse_url() function?

The parse_url() function in php parses the URL and returns the components of the URL. Its syntax is as follows:

Syntax

array parse_url(string $url,int $component)

Parameter details

##$component Specify one of 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 to get the string of the specified part of the URL. (Except when specified as PHP_URL_PORT, an integer value will be returned).

Parameter name	Parameter description
$url	The URL to be parsed, invalid characters will be replaced with _.

ps : This function parses a URL and returns an associative array containing the various components that appear in the URL.

This function is not used to verify the validity of the given URL, but only to break it into the parts listed below. Incomplete URLs are also accepted, and parse_url() will try to parse them as correctly as possible.

Return value

For seriously unqualified URLs, parse_url() may return FALSE.

If the component parameter is omitted, an associative array array will be returned, and there will currently be at least one element in the array. The possible keys in the array are:

• scheme - such as http

• host

• port

• user

• pass

##path
query - after the question mark ?
fragment - after the hash symbol
#If the component parameter is specified, parse_url() Returns a string (or an integer when specified as PHP_URL_PORT ) instead of an array. If the specified component in the URL does not exist, NULL will be returned.

Example

<?php
$url = "http://www.php.cn:8080/index.php?name=wxp&id=2";
$parts = parse_url($url);
print_r($parts);
?>

Code running result:

Let’s look at a more complicated example:

<?php
$url = &#39;http://hello:manong@jiaochen/blog?name=wxp#student&#39;;
print_r(parse_url($url));
echo "<br/><br/>";
echo parse_url($url, PHP_URL_PATH);
?>

Code running result:

As can be seen from this code, we can set the second parameter to obtain each part of the URL . The value of the second parameter can be:

PHP_URL_SCHEME
PHP_URL_HOST
PHP_URL_PORT
PHP_URL_USER
PHP_URL_PASS
PHP_URL_PATH
PHP_URL_QUERY
PHP_URL_FRAGMENT

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