Miscellaneous
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<?
function stringchk ($str) {
$forbidden_chars = array ("/",""","\","..","`","<",">");
$forbidden_words = array ("DELETE","SELECT","UPDATE","ALTER");
$valid = 0;
$contains_forbidden_chars = 0;
$contains_forbidden_words = 0;
foreach ($forbidden_chars as $value) {
if (stristr($str, $value)) {
$contains_forbidden_chars++;
}
}
foreach ($forbidden_words as $value) {
if (stristr($str, $value)) {
$contains_forbidden_words++;
}
}
if ($contains_forbidden_chars == 0 AND $contains_forbidden_words == 0) {
$valid = 1;
}
return $valid;
}
?>
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Usage Example
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<?
include("php/stringchk.php");
$valid = stringchk($str);
if ($valid == 1) {
echo "String $str is valid";
}
else {
echo "String $str contains forbidden chars";
}
?>
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