I am going to validate the file name (either on UNIX, Linux or Windows) which the user input from the HTML textfield element and sent to .php using POST method. However, I have no idea how to check whether it validates or not. Would someone help me on this problem? Thanks a lot.
Problem on checking valid file name ~
First you have kno which characters are allowed in a filename. In windows a filename cannot have any of \/*
?><.
so a sample code will be:
<?php
function chkFileName($filename) {
return (strlen($filename) == strcspn($filename,'\\/*?:<>|'));
}
// remember to escape \ with \\ before passing it to the function.
// cuz a \ at the end of the filename will cause parse errors.
if (chkFileName('valid_filename')) {
echo 'Filename is valid';
} else {
echo 'Filename is not valid';
}
?>