Description: ------------ In Writer/Tar.php it reads like this: $filePrefix = ''; if (strlen($filename) > 255) { return PEAR::raiseError( "$filename is too long to be put in a tar archive" ); } else if (strlen($filename) > 100) { $filePrefix = substr($filename, 0, strlen($filename)-100); $filename = substr($filename, -100); } Actually (at least unix tar handles archives like that) the prefix needs to be a path-component, so that "$filePrefix/$filename" is the actual filename. This is not handled correctly by the above code, so it will inject a slash at strlen()-100 for the filename, resulting in really messy tarfiles. Test script: --------------- A solution might look like this: } else if (strlen($filename) > 100) { #need a path component of max 155 bytes $pos = strrpos(substr($filename, 0, 155), '/'); if(strlen($filename) - $pos > 100) #filename-component may not exceed 100 bytes return PEAR::raiseError( "$filename is too long to be put in a tar archive" ); $filePrefix = substr($filename, 0, $pos); $filename = substr($filename, $pos+1); echo "$filePrefix vs $filename<br>\n"; }