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a guest Mar 26th, 2019 52 Never
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  1. !DOCTYPE HTML>  
  2. <html>
  3. <head>
  4. <style>
  5. .error {color: #FF0000;}
  6. </style>
  7. </head>
  8. <body>  
  9.  
  10. <?php
  11. // define variables and set to empty values
  12. $nameErr = $emailErr = $genderErr = $websiteErr = "";
  13. $name = $email = $gender = $comment = $website = "";
  14.  
  15. if ($_SERVER["REQUEST_METHOD"] == "POST") {
  16.   if (empty($_POST["name"])) {
  17.     $nameErr = "Name is required";
  18.   } else {
  19.     $name = test_input($_POST["name"]);
  20.     // check if name only contains letters and whitespace
  21.     if (!preg_match("/^[a-zA-Z ]*$/",$name)) {
  22.       $nameErr = "Only letters and white space allowed";
  23.     }
  24.   }
  25.  
  26.   if (empty($_POST["email"])) {
  27.     $emailErr = "Email is required";
  28.   } else {
  29.     $email = test_input($_POST["email"]);
  30.     // check if e-mail address is well-formed
  31.     if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
  32.       $emailErr = "Invalid email format";
  33.     }
  34.   }
  35.    
  36.   if (empty($_POST["website"])) {
  37.     $website = "";
  38.   } else {
  39.     $website = test_input($_POST["website"]);
  40.     // check if URL address syntax is valid (this regular expression also allows dashes in the URL)
  41.     if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) {
  42.       $websiteErr = "Invalid URL";
  43.     }
  44.   }
  45.  
  46.   if (empty($_POST["comment"])) {
  47.     $comment = "";
  48.   } else {
  49.     $comment = test_input($_POST["comment"]);
  50.   }
  51.  
  52.   if (empty($_POST["gender"])) {
  53.     $genderErr = "Gender is required";
  54.   } else {
  55.     $gender = test_input($_POST["gender"]);
  56.   }
  57. }
  58.  
  59. function test_input($data) {
  60.   $data = trim($data);
  61.   $data = stripslashes($data);
  62.   $data = htmlspecialchars($data);
  63.   return $data;
  64. }
  65. ?>
  66.  
  67. <h2>PHP Form Validation Example</h2>
  68. <p><span class="error">* required field</span></p>
  69. <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">  
  70.   Name: <input type="text" name="name" value="<?php echo $name;?>">
  71.   <span class="error">* <?php echo $nameErr;?></span>
  72.   <br><br>
  73.   E-mail: <input type="text" name="email" value="<?php echo $email;?>">
  74.   <span class="error">* <?php echo $emailErr;?></span>
  75.   <br><br>
  76.   Website: <input type="text" name="website" value="<?php echo $website;?>">
  77.   <span class="error"><?php echo $websiteErr;?></span>
  78.   <br><br>
  79.   Comment: <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea>
  80.   <br><br>
  81.   Gender:
  82.   <input type="radio" name="gender" <?php if (isset($gender) && $gender=="female") echo "checked";?> value="female">Female
  83.   <input type="radio" name="gender" <?php if (isset($gender) && $gender=="male") echo "checked";?> value="male">Male
  84.   <input type="radio" name="gender" <?php if (isset($gender) && $gender=="other") echo "checked";?> value="other">Other  
  85.   <span class="error">* <?php echo $genderErr;?></span>
  86.   <br><br>
  87.   <input type="submit" name="submit" value="Submit">  
  88. </form>
  89.  
  90. <?php
  91. echo "<h2>Your Input:</h2>";
  92. echo $name;
  93. echo "<br>";
  94. echo $email;
  95. echo "<br>";
  96. echo $website;
  97. echo "<br>";
  98. echo $comment;
  99. echo "<br>";
  100. echo $gender;
  101. ?>
  102.  
  103. </body>
  104. </html>
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