PHP correctly decodes characters encoded by escape in javascript_PHP tutorial

This is one I collected a long time ago. I don’t know who wrote it, but there is no problem after testing~
JavaScript code

Copy code The code is as follows:

function phpUnescape($escstr)
{
preg_match_all("/%u[0-9A-Za-z]{4}|%.{2}|[0-9a -zA-Z.+-_]+/", $escstr, $matches);
$ar = &$matches[0];
$c = "";
foreach($ar as $val)
{
if (substr($val, 0, 1) != "%")
{
$c .= $val;
} elseif (substr($ val, 1, 1) != "u")
{
$x = hexdec(substr($val, 1, 2));
$c .= chr($x);
}
else
{
$val = intval(substr($val, 2), 16);
if ($val < 0x7F) // 0000-007F
{
$c .= chr($val);
} elseif ($val < 0x800) // 0080-0800
{
$c .= chr(0xC0 | ($val / 64) );
$c .= chr(0x80 | ($val % 64));
}
else // 0800-FFFF
{
$c .= chr(0xE0 | ( ($val / 64) / 64));
$c .= chr(0x80 | (($val / 64) % 64));
$c .= chr(0x80 | ($val % 64 ));
}
}
}
return $c;
}

After escape encoding:

Copy code The code is as follows:

%u6D4B%u8BD5www.jb51.net%22%22%27%27%3C%3E%26%26

After decoding:

Copy code The code is as follows:

Test www.jb51.net""''< ;>&&

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