PHP Form Validation Tutorial
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Hello Friends,
Now let's see example of form validation tutorial in php. We will show how to create and validate a basic form using PHP and HTML. In this tutorial i am going to learn you how to validate form using PHP. You will learn about how to submit form with validation in php.
We will create a simple form which will contain various inputs like textbox, checkbox, radio buttons and a submit button. After submitting the form, we will validate the fields with php and show error messages if there are some errors.
Here I will give you full example for php form validation tutorial So let's see bellow example:
index.php
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Form Validation in PHP</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css">
<link rel="stylesheet" href="assets/css/style.css">
</head>
<style type="text/css">
.container {
max-width: 700px;
margin: 50px auto;
}
form {
border: 1px solid #1A33FF;
background: #ecf5fc;
padding: 40px 50px 45px;
}
.form-control:focus {
border-color: #000;
box-shadow: none;
}
.error {
color: red;
font-weight: 400;
display: block;
padding: 6px 0;
font-size: 14px;
}
.form-control.error {
border-color: red;
padding: .375rem .75rem;
}
</style>
<body>
<div class="container mt-5">
<h2 class="text-center mb-4">Demo Form Validation in PHP 7</h2>
<!-- Form validation script -->
<?php include('form_validation.php'); ?>
<!-- Contact form -->
<form action="" method="post" novalidate>
<div class="form-group row">
<label class="col-sm-4 col-form-label">Name</label>
<div class="col-sm-8">
<input type="text" name="name" class="form-control">
<!-- Error -->
<?php echo $nameEmptyErr; ?>
<?php echo $nameErr; ?>
</div>
</div>
<div class="form-group row">
<label class="col-sm-4 col-form-label">Email</label>
<div class="col-sm-8">
<input type="email" name="email" class="form-control">
<!-- Error -->
<?php echo $emailEmptyErr; ?>
<?php echo $emailErr; ?>
</div>
</div>
<div class="form-group row">
<label class="col-sm-4 col-form-label">Education</label>
<div class="col-sm-8">
<select id="education" name="education" class="form-control">
<option selected="" disabled>...</option>
<option value="Graduation">Graduation</option>
<option value="Post Graduation">Post Graduation</option>
</select>
<!-- Error -->
<?php echo $educationEmptyErr; ?>
</div>
</div>
<fieldset class="form-group">
<div class="row">
<legend class="col-form-label col-sm-4 pt-0">Gender</legend>
<div class="col-sm-8">
<div class="custom-control custom-radio custom-control-inline">
<input type="radio" id="male" name="gender" value="Male" class="custom-control-input">
<label class="custom-control-label" for="male">Male</label>
</div>
<div class="custom-control custom-radio custom-control-inline">
<input type="radio" id="female" name="gender" value="Female" class="custom-control-input">
<label class="custom-control-label" for="female">Female</label>
</div>
<!-- Error -->
<?php echo $genderEmptyErr; ?>
</div>
</div>
</fieldset>
<div class="form-group row">
<div class="col-sm-4">Hobbies</div>
<div class="col-sm-8">
<div class="custom-control custom-checkbox custom-control-inline">
<input type="checkbox" name="hoby[]" value="Drawing" class="custom-control-input" id="drawing">
<label class="custom-control-label" for="drawing">Drawing</label>
</div>
<div class="custom-control custom-checkbox custom-control-inline">
<input type="checkbox" name="hoby[]" value="Singing" class="custom-control-input" id="singing">
<label class="custom-control-label" for="singing">Singing</label>
</div>
<div class="custom-control custom-checkbox custom-control-inline">
<input type="checkbox" name="hoby[]" value="Dancing" class="custom-control-input" id="dancing">
<label class="custom-control-label" for="dancing">Dancing</label>
</div>
<!-- Error -->
<?php echo $hobyEmptyErr; ?>
</div>
</div>
<div class="form-group row">
<label class="col-sm-4 col-form-label">Comment</label>
<div class="col-sm-8">
<textarea class="form-control" name="comment" id="comment" rows="4"></textarea>
<!-- Error -->
<?php echo $commentEmptyErr; ?>
</div>
</div>
<div class="form-group row">
<div class="col-sm-12 mt-3">
<button type="submit" name="submit" class="btn btn-primary btn-block">Submit</button>
</div>
</div>
</form>
</div>
</body>
</html>form_validation.php
<?php
// Error messages
$nameEmptyErr = "";
$emailEmptyErr = "";
$educationEmptyErr = "";
$genderEmptyErr = "";
$hobyEmptyErr = "";
$commentEmptyErr = "";
$nameErr = "";
$emailErr = "";
if(isset($_POST["submit"])) {
// Set form variables
$name = checkInput($_POST["name"]);
$email = checkInput($_POST["email"]);
if (!empty($_POST["education"])) {
$education = checkInput($_POST["education"]);
}
if (!empty($_POST["gender"])) {
$gender = checkInput($_POST["gender"]);
}
if (!empty($_POST["hoby"])) {
$hoby = $_POST["hoby"];
}
$comment = checkInput($_POST["comment"]);
// Name validation
if(empty($name)){
$nameEmptyErr = '<div class="error">Name can not be left blank.</div>';
} // Allow letters and white space
else if(!preg_match("/^[a-zA-Z ]*$/", $name)) {
$nameErr = '<div class="error">Only letters and white space allowed.</div>';
} else {
echo $name . '<br>';
}
// Email validation
if(empty($email)){
$emailEmptyErr = '<div class="error">Email can not be left blank.</div>';
} // E-mail format validation
else if (!preg_match("/^([a-z0-9\+_\-]+)(\.[a-z0-9\+_\-]+)*@([a-z0-9\-]+\.)+[a-z]{2,6}$/ix", $email)){
$emailErr = '<div class="error">Email format is not valid.</div>';
} else {
echo $email . '<br>';
}
# code...
// Select option validation
if(empty($education)){
$educationEmptyErr = '<div class="error">Tell us about your education.</div>';
} else {
echo $education . '<br>';
}
// Radio button validation
if(empty($gender)){
$genderEmptyErr = '<div class="error">Specify your gender.</div>';
} else {
echo $gender . '<br>';
}
// Checkbox validation
if(!empty($hoby)){
foreach($_POST['hoby'] as $val){
echo $val . '<br>';
}
} else {
$hobyEmptyErr = '<div class="error">What are your hobbies.</div>';
}
// Text-area validation
if(empty($comment)){
$commentEmptyErr = '<div class="error">This field is required.</div>';
} else {
echo $comment . '<br>';
}
}
function checkInput($input) {
$input = trim($input);
$input = stripslashes($input);
$input = htmlspecialchars($input);
return $input;
}
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