Created
August 29, 2018 16:35
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<!DOCTYPE HTML> | |
<html> | |
<head> | |
<style> | |
.error {color: #FF0000;} | |
</style> | |
</head> | |
<body> | |
<?php | |
// define variables and set to empty values | |
$nameErr = $emailErr = $genderErr = $websiteErr = ""; | |
$name = $email = $gender = $comment = $website = ""; | |
if ($_SERVER["REQUEST_METHOD"] == "POST") { | |
if (empty($_POST["name"])) { | |
$nameErr = "Name is required"; | |
} else { | |
$name = test_input($_POST["name"]); | |
// check if name only contains letters and whitespace | |
if (!preg_match("/^[a-zA-Z ]*$/",$name)) { | |
$nameErr = "Only letters and white space allowed"; | |
} | |
} | |
if (empty($_POST["email"])) { | |
$emailErr = "Email is required"; | |
} else { | |
$email = test_input($_POST["email"]); | |
// check if e-mail address is well-formed | |
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) { | |
$emailErr = "Invalid email format"; | |
} | |
} | |
if (empty($_POST["website"])) { | |
$website = ""; | |
} else { | |
$website = test_input($_POST["website"]); | |
// check if URL address syntax is valid (this regular expression also allows dashes in the URL) | |
if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) { | |
$websiteErr = "Invalid URL"; | |
} | |
} | |
if (empty($_POST["comment"])) { | |
$comment = ""; | |
} else { | |
$comment = test_input($_POST["comment"]); | |
} | |
if (empty($_POST["gender"])) { | |
$genderErr = "Gender is required"; | |
} else { | |
$gender = test_input($_POST["gender"]); | |
} | |
} | |
function test_input($data) { | |
$data = trim($data); | |
$data = stripslashes($data); | |
$data = htmlspecialchars($data); | |
return $data; | |
} | |
?> | |
<h2>PHP Form Validation Example</h2> | |
<p><span class="error">* required field</span></p> | |
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> | |
Name: <input type="text" name="name" value="<?php echo $name;?>"> | |
<span class="error">* <?php echo $nameErr;?></span> | |
<br><br> | |
E-mail: <input type="text" name="email" value="<?php echo $email;?>"> | |
<span class="error">* <?php echo $emailErr;?></span> | |
<br><br> | |
Website: <input type="text" name="website" value="<?php echo $website;?>"> | |
<span class="error"><?php echo $websiteErr;?></span> | |
<br><br> | |
Comment: <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea> | |
<br><br> | |
Gender: | |
<input type="radio" name="gender" <?php if (isset($gender) && $gender=="female") echo "checked";?> value="female">Female | |
<input type="radio" name="gender" <?php if (isset($gender) && $gender=="male") echo "checked";?> value="male">Male | |
<input type="radio" name="gender" <?php if (isset($gender) && $gender=="other") echo "checked";?> value="other">Other | |
<span class="error">* <?php echo $genderErr;?></span> | |
<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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