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php – Strip bad Windows filename characters

Posted by: admin July 12, 2020 Leave a comment

Questions:

I found this function that tests whether a string is Windows filename and folder friendly:

function is_valid_filename($name) {
    $parts=preg_split("/(\/|".preg_quote("\").")/",$name);
    if (preg_match("/[a-z]:/i",$parts[0])) {
       unset($parts[0]);
    }
    foreach ($parts as $part) {
        print "part = '$part'<br>";
       if (preg_match("/[".preg_quote("^|?*<\":>","/")."\a\b\c\e\x\v\s]/",$part)||preg_match("/^(PRN|CON|AUX|CLOCK$|NUL|COMd|LPTd)$/im",str_replace(".","\n",$part))) {
          return false;
       }
    }
    return true;
 }

What I’d rather have is a function that strips all the bad stuff from the string. I tried to basically replace preg_match with preg_replace but no cigar.

How to&Answers:

Following Gordon’s reference, this gives:

$bad = array_merge(
        array_map('chr', range(0,31)),
        array("<", ">", ":", '"', "/", "\", "|", "?", "*"));
$result = str_replace($bad, "", $filename);