Form Validation in PHP
4 min readJul 14, 2020
Here, you can learn Form Validation in PHP with complete source code without any doubt.
Now, Let’s talk about Validation in Form.
First of all you must create a connection file to connect with the database.
Connection.php
<?php
$dbservername="localhost";
$dbuser="root";
$dbpass="";
$dbname="your_database_name";
$conn=mysqli_connect($dbservername,$dbuser,$dbpass,$dbname);
?>Here is the source code of Form Validation….
Register_page.php
<?php
include('Connection.php');
if(isset($_POST['Register']))
{
$fn=$_POST['fname'];
$ln=$_POST['lname'];
$dob=$_POST['dob'];
$phn=$_POST['phone'];
$em=$_POST['email'];
$pass=$_POST['password'];
$cfp=$_POST['cpassword']; session_start();
$_SESSION['fname'] = $fn;
$_SESSION['lname'] = $ln;
$_SESSION['dob'] = $dob;
$_SESSION['phone'] = $phn;
$_SESSION['email'] = $em;
$_SESSION['password'] = $pass;
$_SESSION['cpassword'] = $cfp; //FName
if (empty($fn)){
$fnameErr = "Please Enter First Name";
}
elseif (!preg_match("/^[a-zA-Z]*$/",$fn)){
$fnameErr = "Only Letters And White Space Allowed";
}
//LName
if (empty($ln)){
$lnameErr = "Please Enter Last Name";
}
elseif (!preg_match("/^[a-zA-Z]*$/",$ln)){
$lnameErr = "Only Letters And White Space Allowed";
}
//Gender
if (empty($gn)){
$gnErr = "Please Select anyone of the Above Gender";
}
//DOB
if (empty($dob)){
$dobErr = "Please Enter Your Date Of Birth";
}
//Phone
if (empty($phn)){
$phoneErr = "Please Enter Mobile No upto 10 Digits";
}
elseif (!preg_match("/^\d{10}+$/",$phn)){
$phoneErr = "Please Enter Mobile No upto 10 Digits";
}
if (empty($em)){
$emailErr = "Please Enter Full Email with '@' and '.'";
}
elseif (!filter_var($em,FILTER_VALIDATE_EMAIL)){
$emailErr = "Please Enter Full Email with '@' and '.'";
}
//Password
if (empty($pass)){
$passwordErr = "Please Enter Password";
}
//confirm Password
if (empty($cfp)){
$cpasswordErr = "Please Enter Confirm Password";
}
if(!$fnameErr && !$lnameErr && !$gnErr && !$dobErr && !$phoneErr && !$bloodErr && !$emailErr && !$passwordErr && !$cpassswordErr){ $str = "Insert into signup_master(first_name,last_name,gender,phone,email,password) values ('$fn','$ln','$gn','$phn','$em','$pass')";
$q = mysqli_query($conn,$str);
if ($q) {
echo "<script>alert('Successfully Registered. You can login now');</script>";
}
}
else{
echo "<script>alert('Please Fill The Remaining Fields !!')</script>";
}
}
?><!DOCTYPE html><head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Register_page</title>
<meta name="description" content="Register_page">
<meta name="v iewport" content="width=device-width, initial-scale=1"><link rel="apple-touch-icon" href="">
<link rel="shortcut icon" href=""><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/normalize.css@8.0.0/normalize.min.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.1.3/dist/css/bootstrap.min.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/font-awesome@4.7.0/css/font-awesome.min.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/lykmapipo/themify-icons@0.1.2/css/themify-icons.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/pixeden-stroke-7-icon@1.2.3/pe-icon-7-stroke/dist/pe-icon-7-stroke.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/flag-icon-css/3.2.0/css/flag-icon.min.css">
<link rel="stylesheet" href="assets/css/cs-skin-elastic.css">
<link rel="stylesheet" href="assets/css/style.css"><link href='https://fonts.googleapis.com/css?family=Open+Sans:400,600,700,800' rel='stylesheet' type='text/css'><!-- <script type="text/javascript" src="https://cdn.jsdelivr.net/html5shiv/3.7.3/html5shiv.min.js"></script> -->
<!-- <script type="text/javascript">
function valid()
{
if(document.registration.password.value!= document.registration.password_again.value)
{
alert("Password and Confirm Password Field do not match !!");
document.registration.password_again.focus();
return false;
}
return true;
}</script> --></head>
<body class="bg-light"><div class="sufee-login d-flex align-content-center flex-wrap">
<div class="container">
<div class="login-content">
<div class="login-logo">
<a href="index.html">
<img class="align-content" src="images/logo.png" alt="">
</a>
</div><div class="login-form">
<form action="Register_page.php" method="POST">
<div class="form-group">
<label>First Name</label>
<input type="text" class="form-control" name="fname" value="<?php if(isset($fn)){echo $_SESSION['fname'];}?>" placeholder="First Name">
<span class="text-danger"><?php if (isset($fnameErr)){echo $fnameErr;}?></span>
</div>
<div class="form-group">
<label>Last Name</label>
<input type="text" class="form-control" name="lname" value="<?php if(isset($ln)){echo $_SESSION['lname'];}?>" placeholder="Last Name">
<span class="text-danger"><?php if (isset($lnameErr)){echo $lnameErr;}?></span>
</div><div class="form-group">
<label>Gender</label><br>
Male : <input type="Radio" name="gn" class="" value="Gender" style="size: 20px" >
Female : <input type="Radio" name="gn" class="" value="Gender" style="size: 20px">
<span class="text-danger"><?php if (isset($gnErr)){echo $gnErr;}?></span>
</div>
<div>
Birthdate:   <input type="date" value="days" class="" name="dob">
<span class="text-danger"><?php if (isset($dobErr)){echo $dobErr;}?></span>
</div>
<div class="form-group">
<label>Phone Number</label>
<input type="text" class="form-control" value="<?php if(isset($phn)){echo $_SESSION['phone'];}?>" placeholder="Phone number" name="phone" minlength="10" maxlength="10">
<span class="text-danger"><?php if (isset($phoneErr)){echo $phoneErr;}?></span>
</div>
<div class="form-group">
<label>Email address</label>
<span class="input-icon">
<input type="email" class="form-control" value="<?php if(isset($em)){echo $_SESSION['email'];}?>" placeholder="Email" name="email">
<i class="fa fa-envelope"></i> </span>
<span id="user-availability-status1" style="font-size:12px;"></span>
<span class="text-danger"><?php if (isset($emailErr)){echo $emailErr;}?></span>
</div><div class="form-group">
<label>Password</label>
<span class="input-icon">
<input type="password" class="form-control" value="<?php if(isset($pass)){echo $_SESSION['password'];}?>" minlength="6" placeholder="Password" name="password">
<i class="fa fa-lock"></i> </span>
<span class="text-danger"><?php if (isset($passwordErr)){echo $passwordErr;}?></span>
</div><div class="form-group">
<label>Confirm Password</label>
<span class="input-icon">
<input type="password" class="form-control" placeholder="Confirm Password" value="<?php if(isset($cfp)){echo $_SESSION['cpassword'];}?>" minlength="6" name="cpassword">
<i class="fa fa-lock"></i> </span>
<span class="text-danger"><?php if (isset($cpasswordErr)){echo $cpasswordErr;}?></span>
</div><div class="checkbox">
<label>
<input type="checkbox"> Agree the terms and policy
</label>
</div>
<button type="submit" class="btn btn-primary btn-flat m-b-30 m-t-30" name="Register">Register</button>
<div class="register-link m-t-15 text-center">
<p>Already have account ? <a href="login2.php"> Sign in</a></p>
</div>
</form>
</div>
</div>
</div>
</div></body>
</html>
Screenshots:
Cheers! You’re good to go.
I hope you’ve found this article informative and helpful. I’d love to hear your feedback!
Thanks for reading! :)
