I am working on a PHP application that has to parse strings being sent by another program. the problem is that some strings have octal characters and some other escapes in the middle.
So instead of script>XYZ, I am getting:
\103RI\120T>XYZ%6En \151\156 d%6Fcu\155%65n..
And I need to print back this string decoded... I tried using octdec, url_decode, etc, but one only works with one char and the other doesn't decode octal... Anyone have suggestions?
Use preg_replace_callback(). Use a pattern that matches both the octal number, and the escapes (being sure to match also the \, and % characters. Basing on the first character, the callback should be able to understand if to convert a octal number, or to convert an escape sequence.
The callback can convert the number from octal, or hexadecimal, using base_convert() (base_convert($match, 8, 10) in the first case; base_convert($match, 16, 10) in the second case).
), or a hexadecimal number (it starts with %).hexdec() as throwing an error but I've solved it now. There is no need to use a callback, preg_replace() will do just fine, check my answer.Try this:
$str = '\103RI\120T>XYZ%6En \151\156 d%6Fcu\155%65n..';
// CRIPT>XYZnn in documen..
echo preg_replace(array('~\\\(\d+)~e', '~%([0-9A-F]{2})~e'), array('chr(octdec("$1"))', 'chr(hexdec("$1"))'), $str);
Regarding the %AD parts, I'm not sure what are meant to representing, could you explain?
urldecode(stripcslashes("\103RI\120T>XYZ%6En \151\156 d%6Fcu\155%65n.."));
stripcslashes() doesn't handle %AE; it handles \xAE.$octstr = '\103RI\120T>XYZ%6En \151\156 d%6Fcu\155%65n';
preg_match_all('/\\\[0-9]{3}/',$octstr,$matches);
$oct = $matches[0];
foreach($oct as $o){
$octstr = str_replace($o,chr(octdec($o)),$octstr);
}
echo urldecode($octstr);
outputs:
CRIPT>XYZnn in documen
