the success message is not displaying after form submission, still it's displaying error message "Please enter a valid mobile number." it should display Success message.
<?php
function filterMobileno($field){
// Sanitize mobile number
$field = filter_var($field, FILTER_SANITIZE_NUMBER_INT);
// Validate mobile number
if(filter_var($field, FILTER_VALIDATE_INT)){
return $field;
}else{
return FALSE;
}
}
// Define variables and initialize with empty values
$mobilenoErr = "";
$mobile_no = "";
// Processing form data when form is submitted
if($_SERVER["REQUEST_METHOD"] == "POST"){
// Validate mobile number
if(empty($_POST["mobile_no"])){
$mobilenoErr = 'Please enter your mobile number.';
}else{
$mobile_no = filterMobileno($_POST["mobile_no"]);
if($mobile_no == FALSE){
$mobilenoErr = 'Please enter a valid mobile number.';
}
elseif(!preg_match("/^\d{10}$/", $mobile_no) ) {
$mobilenoErr = 'Please enter 10 digit Mobile Number.';
}
}
if(empty($mobilenoErr)){
echo 'success';
}
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Missed Call Alert</title>
<!-- Bootstrap -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<link href="css/style.css" rel="stylesheet">
<!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->
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<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<![endif]-->
<style type="text/css">
.error{ color: red; }
.success{ color: green; }
</style>
</head>
<div class="navbar navbar-default navbar-fixed-top" role="navigation">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target=".navbar-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="http://manage.smspanel.in">SMSPanel.in</a>
</div>
<div class="navbar-collapse collapse">
<ul class="nav navbar-nav navbar-right">
<li><a href="#"><?php echo $_SESSION['sess_username'];?></a></li>
<li><a href="templates.php">Templates</a></li>
<li><a href="compose_message.php">Compose Message</a></li>
<li><a href="logout.php">Logout</a></li>
</ul>
</div>
</div>
</div>
<div class="container">
<div class="info">
<h2 class="bg-primary">Missed Call Control Panel</h2>
<div class="col-md-6 col-md-offset-3">
<h4></span>Register New Mobile Number<span class="glyphicon glyphicon-user"></h4><br/>
<div class="block-margin-top">
<form action="compose_message.php" method="POST" class="form-signin col-md-8 col-md-offset-2" role="form">
<input type="text" name="mobile_no" class="form-control" placeholder="Mobile Number" value="<?php echo $mobile_no; ?>"><br/>
<span class="error"><?php echo $mobilenoErr; ?></span>
<!-- <input type="password" name="password" class="form-control" placeholder="Password" required><br/>-->
<button class="btn btn-lg btn-primary btn-block" type="submit">Submit</button>
</form>
</div>
</div>
</div>
</div>
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="js/bootstrap.min.js"></script>
</body>
</html>