note 50296 deleted from function.str-replace by bjori
| From: | bjori@php.net | Date: | Sun, 26 Mar 2006 22:25:53 +0000 |
| Subject: | note 50296 deleted from function.str-replace by bjori | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-106677@lists.php.net to get a copy of this message | ||
Note Submitter: dambkruck AT hotmail dot com
----
I'm not sure that this is the right place, but I believe that it is useful for the accents
problem. I just wrote and tested this script because I'm using a variable from $_GET to open a
text file and I do not want to allow anyone to go searching thru my folders by entering ../ (or
other malicious stuff that I don't know about). Anyway, this function returns true if the
string passed to it is only made up of letters (upper/lower case) or numbers.
<?PHP
//-------------------------------------------------------------------
//allowed chars from 48-57,65-90,97-122 AKA 0-9, A-Z, a-z
//-------------------------------------------------------------------
function isAlphaNumeric($checkThisString){
$result = true;
$i=0;
while($i<strlen($checkThisString) && $result){
$char = substr($checkThisString,$i,1);
$charNum = ord($char);
if( !(($charNum>47 && $charNum < 58) || ($charNum>64 && $charNum < 91)
|| ($charNum>96 && $charNum < 123)) )
$result = false;
$i++;
}
return $result;
}
?>
cheers,
Adam F-K