PHP function introduction—rawurldecode(): Decode URL

PHP function introduction—rawurldecode(): Decode URL

In web development, we often need to process URLs, and special characters in URLs need to be encoded to be correctly transmitted and parsed. In some cases, we need to decode the URL and restore the encoded string to the original URL. PHP provides a series of functions to handle URL encoding and decoding, one of which is the rawurldecode() function.

rawurldecode() function decodes a URL-encoded string and restores it to the original URL. It is mainly suitable for decoding strings encoded by the urlencode() function for easy processing and display.

The following is the syntax of the rawurldecode() function:

string rawurldecode ( string $str )

Among them, $str represents the URL string to be decoded, and the function will return the decoded string.

The following is a code example that shows how to use the rawurldecode() function to decode the URL:

<?php
$url = "https%3A%2F%2Fwww.example.com%2F%3Fq%3D%D0%B4%D0%BE%D0%B1%D1%80%D1%8B%D0%B9%E6%B1%89%E5%AD%97"; // 经过urlencode()编码的URL

$decodedUrl = rawurldecode($url);

echo $decodedUrl;
?>

In the above example, a URL is encoded by the urlencode() function and then assigned to $url variable and then decode it using the rawurldecode() function. Finally, the decoded URL string is output through the echo statement.

Run the above code, the output result is:

https://www.example.com/?q=добрый汉字

We can see that after decoding the encoded URL string through the rawurldecode() function, the original URL string is obtained.

It should be noted that the rawurldecode() function will only decode special characters in the URL and will not process other characters in the URL parameters. If you need to decode the entire URL, you can use the urldecode() function.

To summarize, the rawurldecode() function is a shortcut in PHP for decoding URLs. It decodes the URL string encoded by the urlencode() function and restores it to the original URL. In web development, it is often necessary to use it to deal with URL encoding and decoding issues to ensure the correctness of passing and parsing URL parameters.

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