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<!DOCTYPE HTML>   <html> <head> <style> .error {color: #FF0000;} </style> </head> <body>    <?php // define variables and set to empty values $nameErr = $emailErr = $genderErr = $websiteErr = ""; $name = $email = $gender = $comment = $website = "";  if ($_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["email"])) {     $emailErr = "Email is required";   } else {     $email = test_input($_POST["email"]);     // check if e-mail address is well-formed     if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {       $emailErr = "Invalid email format";     }   }    if (empty($_POST["website"])) {     $website = "";   } else {     $website = test_input($_POST["website"]);     // check if URL address syntax is valid (this regular expression also allows dashes in the URL)     if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) {       $websiteErr = "Invalid URL";     }   }    if (empty($_POST["comment"])) {     $comment = "";   } else {     $comment = test_input($_POST["comment"]);   }    if (empty($_POST["gender"])) {     $genderErr = "Gender is required";   } else {     $gender = test_input($_POST["gender"]);   } }  function test_input($data) {   $data = trim($data);   $data = stripslashes($data);   $data = htmlspecialchars($data);   return $data; } ?>  <h2>PHP Form Validation Example</h2> <p><span class="error">* required field.</span></p> <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">     Name: <input type="text" name="name" value="<?php echo $name;?>">   <span class="error">* <?php echo $nameErr;?></span>   <br><br>   E-mail: <input type="text" name="email" value="<?php echo $email;?>">   <span class="error">* <?php echo $emailErr;?></span>   <br><br>   Website: <input type="text" name="website" value="<?php echo $website;?>">   <span class="error"><?php echo $websiteErr;?></span>   <br><br>   Comment: <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea>   <br><br>   Gender:   <input type="radio" name="gender" <?php if (isset($gender) && $gender=="female") echo "checked";?> value="female">Female   <input type="radio" name="gender" <?php if (isset($gender) && $gender=="male") echo "checked";?> value="male">Male   <span class="error">* <?php echo $genderErr;?></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 $website; echo "<br>"; echo $comment; echo "<br>"; echo $gender; ?>
 
  
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