Form Validation in PHP

Example:-

v.php
 
 <!DOCTYPE HTML>  
 <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)) {
      $emailError = "Invalid email format"; 
     }
   }}
  function test_input($data) {
    $data = trim($data);
    $data = stripslashes($data);
    $data = htmlspecialchars($data);
    return $data;
   }
   ?>
 
 <h2>Registration Form </h2>
 <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>
  <input type="submit" name="submit" value="Submit">  
 </form>

  <?php
  echo "<h2>Your Input:</h2>";
  echo $name;
   echo "<br>";
   echo $email;
  echo "<br>";
   echo "<br>";
  echo $mobile;
   echo "<br>";
   ?>
</body>
</html>
Ourput:-

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Form Validation in PHP

Example:-

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