Validation in PHP
<html>
<head><style>.error {color: #FF0000;}</style></head>
<body>
<?php
/*
define variables and set to empty values */
$nameErr = $emailError = $mobileError ="";
$name = $email = $mobile = "";
if ($_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["name"])) {
$mobileError = "Name is required";
} else {
$mobile = test_input($_POST["mobile"]);
/*
check if name only
contains letters and whitespace */
if (!preg_match('/^[0-9]{10}+$/', $mobile)) {
$mobileError = "10 digit Number";
}
}
if (empty($_POST["email"]))
{
$emailError = "Email is required";
}
else
{
$email = test_input($_POST["email"]);
/*
check if e-mail address is well-formed */
if (!filter_var($email, FILTER_VALIDATE_EMAIL))
{
$emailError = "Invalid email format";
}
}
if (empty($_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 $data;
}
?>
<form method="post"
action="<?php echo
htmlspecialchars($_SERVER["PHP_SELF"]);?>">
Name: <input type="text"
name="name" value="<?php echo $name;?>">
<span class="error">* <?php echo $nameErr;?></span><br><br>
Mobile: <input type="text"
name="mobile" value="<?php echo $mobile;?>">
<span class="error">* <?php echo $mobileError;?></span><br><br>
E-mail: <input type="text"
name="email" value="<?php echo $email;?>">
<span class="error">* <?php echo $emailError;?></span><br><br>
Gender:
<input type = "radio" name =
"gender" value = "female">Female
<input type = "radio" name =
"gender" value = "male">Male
<span class = "error">* <?php
echo $genderErr;?></span><br><br>
<input type="submit"
name="submit" value="Submit">
</form>
</body>
</html>
