File: fwphp/glomodul/z_examples/login_form_validation.php

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File: fwphp/glomodul/z_examples/login_form_validation.php
Role: Auxiliary script
Content type: text/plain
Description: Auxiliary script
Class: B12 PHP FW
Manage database records with a PDO CRUD interface
Author: By
Last change: ver 7.0.2 mnu, msg, mkd FUNCTIONAL namespaces, CRUD PDO trait, pretty URL-s
Date: 2 months ago
Size: 3,114 bytes
 

Contents

Class file image Download
<!DOCTYPE HTML>
<html>
<head>
  <style>
  .error {color: #FF0000;}
  </style>
</head>
<body>

  <?php
 
function myfilter_input($data) {
   
$data = trim($data);
   
$data = stripslashes($data);
   
//$data = htmlspecialchars($data);
   
$data = htmlspecialchars($data, ENT_QUOTES, 'UTF-8');
    return
$data;
  }

 
// 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 {
$name = myfilter_input($_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 {
     
$email = myfilter_input($_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 {
$website = myfilter_input($_POST["website"]);
     
//check if URL address syntax is valid (this reg.expr. also allows dashes in 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 {
$comment = myfilter_input($_POST["comment"]); }

    if (empty(
$_POST["gender"])) { $genderErr = "Gender is required";
    } else {
$gender = myfilter_input($_POST["gender"]); }
  }

 
?>



  <h2>PHP Form Validation Example</h2>

  <p><span class="error">* required field</span></p>
  <form method="post" action="<?=htmlspecialchars($_SERVER["PHP_SELF"])?>">

    Name: <input type="text" name="name" value="<?=$name?>">
    <span class="error">* <?=$nameErr?></span>

    <br><br>E-mail: <input type="text" name="email" value="<?=$email?>">
    <span class="error">* <?=$emailErr?></span>

    <br><br>Website: <input type="text" name="website" value="<?=$website?>">
    <span class="error"><?=$websiteErr?></span>

    <br><br>Comment: <textarea
        name="comment" rows="5" cols="40"><?=$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
    <input type="radio" name="gender" <?php
     
if (isset($gender) && $gender=="other") echo "checked"; ?> value="other">Other
    <span class="error">* <?=$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;
 
?>

</body>
</html>

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