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PHP FORM: Prevent Cross-site scripting (XSS)
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<!-- SOURCE: https://www.w3schools.com/php/php_form_validation.asp --> | |
<!-- | |
LOGIC: | |
htmlspecialchars() - prevent Cross-Site Scripting (XSS) attacks. | |
trim() - Strip unnecessary characters (extra space, tab, newline). | |
stripslashes() - Remove backslashes (\). | |
--> | |
<!-- SCRIPT --> | |
<!DOCTYPE HTML> | |
<html> | |
<head> | |
</head> | |
<body> | |
<?php | |
// define variables and set to empty values | |
$name = $email = $gender = $comment = $website = ""; | |
if ($_SERVER["REQUEST_METHOD"] == "POST") { | |
$name = test_input($_POST["name"]); | |
$email = test_input($_POST["email"]); | |
$website = test_input($_POST["website"]); | |
$comment = test_input($_POST["comment"]); | |
$gender = test_input($_POST["gender"]); | |
} | |
function test_input($data) { | |
$data = trim($data); | |
$data = stripslashes($data); | |
$data = htmlspecialchars($data); | |
return $data; | |
} | |
?> | |
<h2>PHP Form Validation Example</h2> | |
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> | |
Name: <input type="text" name="name"> | |
<br><br> | |
E-mail: <input type="text" name="email"> | |
<br><br> | |
Website: <input type="text" name="website"> | |
<br><br> | |
Comment: <textarea name="comment" rows="5" cols="40"></textarea> | |
<br><br> | |
Gender: | |
<input type="radio" name="gender" value="female">Female | |
<input type="radio" name="gender" value="male">Male | |
<input type="radio" name="gender" value="other">Other | |
<br><br> | |
<input type="submit" name="submit" value="Submit"> | |
</form> | |
<?php | |
echo "<h2>Your Input:</h2>"; | |
echo $name; | |
echo "<br>"; | |
echo $email; | |
echo "<br>"; | |
echo $website; | |
echo "<br>"; | |
echo $comment; | |
echo "<br>"; | |
echo $gender; | |
?> | |
</body> | |
</html> |
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