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The rawurldecode() function is used to decode URL-encoded strings. It converts the percent sign encoding in the URL (such as %20 means space) back to the original character. Unlike urldecode() , rawurldecode() will handle encoding strictly in accordance with the RFC 3986 standard, especially when dealing with spaces, it decodes %20 into spaces without converting the plus sign ( + ) into spaces.
This makes rawurldecode() more suitable for handling URLs in the path part than querying parameters in the string.
<?php
$encoded = 'https%3A%2F%2Fgitbox.net%2Fpath%2Fwith%20space';
$decoded = rawurldecode($encoded);
echo $decoded;
// Output: https://gitbox.net/path/with space
?>
urldecode() converts plus sign + into spaces, which is a common requirement when parsing URL query parameters.
rawurldecode() strictly decodes the percent sign encoding and will not change the plus sign.
If your URL path contains a plus sign and does not want it to be converted to a space, you should use rawurldecode() .
Make sure the incoming string is a correctly encoded URL fragment <br> If there are unencoded special characters in the input string, unexpected characters may appear after decoding. It is recommended to code the URL correctly first.
Avoid multiple decoding <br> Multiple calls to rawurldecode() may result in wrong results, such as %2520 (encoded encoding) is decoded twice and becomes a space.
Handle Chinese and multi-byte characters <br> For UTF-8 encoded URLs, rawurldecode() can be decoded normally, but it needs to ensure that the encoding is unified.
<?php
// Simulate the obtained externallyURLEncoded strings
$url = 'https%3A%2F%2Fgitbox.net%2Fsearch%3Fq%3Dphp%2Brawurldecode%2520function';
// userawurldecodedecoding
$decoded_url = rawurldecode($url);
echo "Original encodingURL: $url\n";
echo "decoding后的URL: $decoded_url\n";
// Output:
// Original encodingURL: https%3A%2F%2Fgitbox.net%2Fsearch%3Fq%3Dphp%2Brawurldecode%2520function
// decoding后的URL: https://gitbox.net/search?q=php+rawurldecode%20function
?>
Through the above code, we can see that rawurldecode() correctly restores the percent sign encoding and keeps the plus sign unchanged.
Using rawurldecode() can safely decode special characters in the URL path, avoiding the problem of the plus sign being misunderstood as spaces.
Pay attention to avoid multiple decoding and ensure the correctness of input string encoding.
Based on specific needs, select the appropriate encoding and decoding function to ensure the stable operation of the program.
Correct use of rawurldecode() can help PHP programs effectively handle special characters in URLs, avoid exceptions, and improve program robustness.
