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If a user gives the path:"./....//....//....//....//....//....//....//"then your script detects every "../" and removes them leaving:"./../../../../../../../"Which is proberly going back enough times to show root.I just found this vunrability in an old script of mine, which was written several years ago.This is due to the PCRE library returning an error code if the string contains bad UTF-8.People using the /e modifier with preg_replace should be aware of the following weird behaviour.There seems to be some unexpected behavior when using the /m modifier when the line terminators are win32 or mac format. Try preg_replace (and other preg-functions) return null instead of a string when encountering problems you probably did not think about!If you have a string like below, and try to replace dots, the regex won't replace correctly: This code must convert numeric html entities to utf8. It treats wrong codes starting with The reason is that code2utf will be called with leading zero, exactly what the pattern matches - code2utf(039). -------------------------It may not be obvious to everybody that the function returns NULL if an error of any kind occurres. Opening parentheses are counted from left to right (starting from 1) to obtain the number of the capturing subpattern.To use backslash in replacement, it must be doubled ( PHP string).
Always do:"---------------------Heeeeeeeeeeeeeeeeeeeello Woooooooooooooooorld!!!!!!!!!!!!!!!!!!!!!!!! ===============================================================================================================~~~~~~~~~~~~~~~~ ~ ~ ~" I find it useful to output HTML form names to the user from time to time while going through the $_GET or $_POST on a user's submission and output keys of the GET or POST array...
the only problem being in the name attribute I follow common programming guidelines and have names like the following: event Date, event Time, user Email, etc.
It is not a bug per se, but can cause bugs if you don't know it's there.
The example in the docs for /e suffers from this mistake in fact.
However, if you put this inside a set of single quotes, PHP will not strip away all the slashes correctly!