Implement Javascript's escape() function code in PHP_PHP tutorial

Here, it is generally necessary to pre-encode the normal string into a format that can be interpreted by the JavaScript unescape() function. Taking PHP as an example, you can use the following function to achieve the same function as the escape() function in Javascript:

Copy code The code is as follows:

function escapeToHex($string, $encoding = UTF-8) {
$return = ;
for ($x = 0; $x $str = mb_substr($string, $x, 1, $ encoding);
if (strlen($str) > 1) { // Multi-byte characters
$return .= %u . strtoupper(bin2hex(mb_convert_encoding($str, UCS-2, $encoding) ));
} else {
$return .= % . strtoupper(bin2hex($str));
}
}
return $return;
}
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Suppose we want to hide the following address: http://www.dirk.sh/assets/uploaded/thisistest.pdf
We can use the following script to achieve this:

Copy the code The code is as follows:

// Please include the escapeToHex() function definition yourself
$test = document.write(test);
echo

If you look at the page source, you will see (because It is too long, so manual branching is performed. The actual running result should be a complete line):

Copy the code The code is as follows:

The page displayed in the browser is no different from ordinary html.
Note:
1. The second parameter ($encoding) of the escapeToHex() function indicates the encoding of the string you pass in. The default is UTF-8. If you use other encodings, you should call the function Explicitly specified;
2. The use of unescape() is deprecated in the ECMAScript v3 specification. The specification recommends using the new alternative function decodeURIComponent(), but I found through testing that the decodeURIComponent() function does not support multi-byte characters (Chinese). ) processing problem, so the unescape() function is still used.
3. In principle, the above method is only to prevent search crawlers from obtaining the resource addresses that you think need to be kept confidential. When browsing the page in a browser that supports Javascript, the rendering seen without this protection mechanism is completely different. Same.

http://www.bkjia.com/PHPjc/322351.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/322351.htmlTechArticleHere, it is generally necessary to pre-encode the normal string into a format that can be interpreted by the JavaScript unescape() function. Taking PHP as an example, you can use the following function to implement escap in Javascript...