Php Form Validation Example

Today, We will explain to you how to make form validation in PHP(Php Form Validation Example). when the user submitted the form at that time required for input field validation. there are two types of validation, the first is server-side and the second is client-side. see below example of server-side validation(Php Form Validation Example).

Required field, email validation and number required .. etc I will give validation information by our post.

Read Also:
Jquery Form Validation Example

See below code, that is an array wise creating a form validation, whenever error generate at that time count error array element, if count greater than 0, we are showing the error message.

<?php
if(isset($_POST['btnadd']))
{
    $first_name  = $_POST['txtFname'];
    $last_name   = $_POST['txtLname'];
    $address     = $_POST['txtAddress'];
    $email       = $_POST['txtEmail'];
    $mobile      = $_POST['txtMobile'];
	
	$error=array();
	
	if(empty($first_name)){
	   $error['first_name']="First Name is required";
	}
	if(empty($last_name)){
	   $error['last_name']= "Last Name is required";
	}
	if(empty($email)){
	   $error['email']= "Email is required";
	}
	else
	{
	   if(!filter_var($email, FILTER_VALIDATE_EMAIL)){
		 $error['email']= "Invalid email format"; 
	   }
	}
	if (empty($mobile)) {
	   $error['mobile']= "Mobile is required";
	}
	else{
	   if (preg_match('/[^0-9]+$/', $mobile)){
		 $error['mobile']= "Only Number allowed"; 
	   }
	}
	$count=count($error);
	if($count>0){
		echo "Validation is Success";
	}
}
?>
<style>
     .error {color: #FF0000;}
</style>
<form method="post" name="frmAdd">
        <table align="center">
            <tr>
                <td colspan="2" align="center">Add Record</td>
            </tr>

            <tr>
                <td>First Name</td>
                <td>
		 <input type="text" name="txtFname" value="<?php echo @$first_name; ?>"> 
		 <span class = "error">* <?php echo '<br>'.@$error['first_name'];?></span>
		</td>
            </tr>
            <tr>
                <td>Last Name</td>
                <td>
		 <input type="text" name="txtLname" value="<?php echo @$last_name; ?>"> 
		 <span class = "error">* <?php echo '<br>'.@$error['last_name'];?></span>
               </td>
            </tr>
            <tr>
                <td>Address</td>
                <td><textarea name="txtAddress" rows="4" cols="16"></textarea> </td>
            </tr>
            <tr>
                <td>Email</td>
                <td>
		 <input type="text" name="txtEmail" value="<?php echo @$email; ?>"> 
		 <span class = "error">* <?php echo '<br>'.@$error['email'];?></span>
		</td>
            </tr>
            <tr>
                <td>Mobile</td>
                <td>
		  <input type="text" name="txtMobile" value="<?php echo @$mobile; ?>"> 
		  <span class = "error">* <?php echo '<br>'.@$error['mobile'];?></span>	
		</td>
            </tr>
            <tr>
                <td colspan="2" align="center">
                  <input type="submit" value="Add" name="btnadd"> 
               </td>
            </tr>
        </table>
</form>

<?php

if(isset($_POST['btnadd']))

{

$first_name = $_POST['txtFname'];

$last_name = $_POST['txtLname'];

$address = $_POST['txtAddress'];

$email = $_POST['txtEmail'];

$mobile = $_POST['txtMobile'];

$error=array();

if(empty($first_name)){

$error['first_name']="First Name is required";

}

if(empty($last_name)){

$error['last_name']= "Last Name is required";

}

if(empty($email)){

$error['email']= "Email is required";

}

else

{

if(!filter_var($email, FILTER_VALIDATE_EMAIL)){

$error['email']= "Invalid email format";

}

if (empty($mobile)) {

$error['mobile']= "Mobile is required";

}

else{

if (preg_match('/[^0-9]+$/', $mobile)){

$error['mobile']= "Only Number allowed";

}

$count=count($error);

if($count>0){

echo "Validation is Success";

}

<style>

.error {color: #FF0000;}

</style>

<tr>

<td colspan="2" align="center">Add Record</td>

</tr>

<tr>

<td>First Name</td>

<td>

<span class = "error">* <?php echo '<br>'.@$error['first_name'];?></span>

</td>

</tr>

<tr>

<td>

<span class = "error">* <?php echo '<br>'.@$error['last_name'];?></span>

</td>

</tr>

<tr>

<td>Address</td>

</tr>

<tr>

<td>Email</td>

<td>

<span class = "error">* <?php echo '<br>'.@$error['email'];?></span>

</td>

</tr>

<tr>

<td>Mobile</td>

<td>

<span class = "error">* <?php echo '<br>'.@$error['mobile'];?></span>

</td>

</tr>

<tr>

</td>

</tr>

</table>

</form>