<html>      

<head>      

<title>PHP Form Validation</title>   

</head>    

<body>      

<?php                  

// define variables and set to empty values         

$name = $email = $gender = $comment = $website = "";                  

if ($_SERVER["REQUEST_METHOD"] == "POST") 

{            

$name = test_input($_POST["name"]);            

$email = test_input($_POST["email"]);            

$website = test_input($_POST["website"]);            

$comment = test_input($_POST["comment"]);            

$gender = test_input($_POST["gender"]);         

}                 

 function test_input($data) 

{            

$data = trim($data);            

$data = stripslashes($data);            

$data = htmlspecialchars($data);            

return $data;         

}     

?>

<h2>Tecklearn Absolute classes registration</h2>            

<form method = "post" action = "/php/php_form_introduction.htm">         

<table>            

<tr>               

<td>Name:</td>                

<td><input type = "text" name = "name"></td>           

 </tr>                        

<tr>               

<td>E-mail:</td>               

<td><input type = "text" name = "email"></td>           

 </tr>                        

<tr>               

<td>Specific Time:</td>               

<td><input type = "text" name = "website"></td>           

 </tr>                        

<tr>               

<td>Class details:</td>               

<td><textarea name = "comment" rows = "5" cols = "40"></textarea></td>            

</tr>                       

 <tr>               

<td>Gender:</td>              

 <td>                  

<input type = "radio" name = "gender" value = "female">Female                 

 <input type = "radio" name = "gender" value = "male">Male               

</td>            

</tr>                     

<tr>               

<td>                  

<input type = "submit" name = "submit" value = "Submit">                

</td>            

</tr>         

</table>      

</form>            

<?php        

 echo "<h2>Your Given details are as :</h2>";        

 echo $name;         

echo "<br>";                 

 echo $email;         

echo "<br>";                  

echo $website;        

 echo "<br>";                 

 echo $comment;         

echo "<br>";                  

echo $gender;      

?>         

</body>

</html>

PHP – Validation Example

Required field will check whether the field is filled or not in the proper way. Most of cases we will use the * symbol for required field.

What is Validation ?

Validation means check the input submitted by the user. There are two types of validation are available in PHP. They are as follows −

Client-Side Validation − Validation is performed on the client machine web browsers.
Server Side Validation − After submitted by data, The data has sent to a server and perform validation checks in server machine.

Some of Validation rules for field

Field	Validation Rules
Name	Should required letters and white-spaces
Email	Should required @ and .
Website	Should required a valid URL
Radio	Must be selectable at least once
Check Box	Must be checkable at least once
Drop Down menu	Must be selectable at least once

Valid URL

Below code shows validation of URL

$website = input($_POST["site"]); 
if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) 
{   
$websiteErr = "Invalid URL"; 
}

Above syntax will verify whether a given URL is valid or not. It should allow some keywords as https, ftp, www, a-z, 0-9,..etc..

Valid Email

Below code shows validation of Email address

$email = input($_POST["email"]); 
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) 
{
$emailErr = "Invalid format and please re-enter valid email"
; 
}

Above syntax will verify whether given Email address is well-formed or not.if it is not, it will show an error message.

Example

Example below shows the form with required field validation

<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"]);           
}                        
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"]);            
}                        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 $data;         
}      
?>           
<h2>Absolute classes registration</h2>           
<p><span class = "error">* required field.</span></p>          
 <form method = "post" action = "
<?php          
echo htmlspecialchars($_SERVER["PHP_SELF"]);
?>">         
<table>            
<tr>               
<td>Name:</td>               
<td><input type = "text" name = "name">                  
<span class = "error">* <?php echo $nameErr;?></span>               
</td>            
</tr>                       
<tr>              
<td>E-mail: </td>               
<td><input type = "text" name = "email">                  
<span class = "error">* <?php echo $emailErr;?></span>               
</td>            
</tr>                       
<tr>               
<td>Time:</td>               
<td> <input type = "text" name = "website">                  
<span class = "error"><?php echo $websiteErr;?></span>              
</td>            
</tr>                       
<tr>               
<td>Classes:</td>               
<td> <textarea name = "comment" rows = "5" cols = "40"></textarea></td>            
</tr>                        
<tr>               
<td>Gender:</td>              
 <td>                  
<input type = "radio" name = "gender" value = "female">Female                 
 <input type = "radio" name = "gender" value = "male">Male                 
 <span class = "error">* <?php echo $genderErr;?></span>              
 </td>            
</tr>                                                                         
<td>               
<input type = "submit" name = "submit" value = "Submit">             
</td>                                                                      
</table>                                                   
</form>            
<?php         
echo "<h2>Your given values are as:</h2>";         
echo $name;         
echo "<br>";                  
echo $email;         
echo "<br>";                 
echo $website;         
echo "<br>";                
echo $comment;         
echo "<br>";                 
echo $gender;      
?>      
</body>
</html>

It will produce the following result −

PHP – Complete Form

This page explains about time real-time form with actions. Below example will take input fields as text, radio button, drop down menu, and checked box.

Example

 <html>

  

   <head>

      <style>

         .error {color: #FF0000;}

      </style>

   </head>

  

   <body>

      <?php

         // define variables and set to empty values

         $nameErr = $emailErr = $genderErr = $websiteErr = "";

         $name = $email = $gender = $class = $course = $subject = "";

        

         if ($_SERVER["REQUEST_METHOD"] == "POST") {

            if (empty($_POST["name"])) {

               $nameErr = "Name is required";

            }else {

               $name = test_input($_POST["name"]);

            }

           

            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["course"])) {

               $course = "";

            }else {

               $course = test_input($_POST["course"]);

            }

           

            if (empty($_POST["class"])) {

               $class = "";

            }else {

               $class = test_input($_POST["class"]);

            }

           

            if (empty($_POST["gender"])) {

               $genderErr = "Gender is required";

            }else {

               $gender = test_input($_POST["gender"]);

            }

           

            if (empty($_POST["subject"])) {

               $subjectErr = "You must select 1 or more";

            }else {

               $subject = $_POST["subject"];             

            }

         }

        

         function test_input($data) {

            $data = trim($data);

            $data = stripslashes($data);

            $data = htmlspecialchars($data);

            return $data;

         }

      ?>

                              

      <h2>Absolute classes registration</h2>

     

      <p><span class = "error">* required field.</span></p>

     

      <form method = "POST" action = "<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">

         <table>

            <tr>

               <td>Name:</td>

               <td><input type = "text" name = "name">

                  <span class = "error">* <?php echo $nameErr;?></span>

               </td>

            </tr>

           

            <tr>

               <td>E-mail: </td>

               <td><input type = "text" name = "email">

                  <span class = "error">* <?php echo $emailErr;?></span>

               </td>

            </tr>

           

            <tr>

               <td>Time:</td>

               <td> <input type = "text" name = "course">

                  <span class = "error"><?php echo $websiteErr;?></span>

               </td>

            </tr>

           

            <tr>

               <td>Classes:</td>

               <td> <textarea name = "class" rows = "5" cols = "40"></textarea></td>

            </tr>

           

            <tr>

               <td>Gender:</td>

               <td>

                  <input type = "radio" name = "gender" value = "female">Female

                  <input type = "radio" name = "gender" value = "male">Male

                  <span class = "error">* <?php echo $genderErr;?></span>

               </td>

            </tr>

           

            <tr>

               <td>Select:</td>

               <td>

                  <select name = "subject[]" size = "4" multiple>

                     <option value = "Android">Android</option>

                     <option value = "Java">Java</option>

                     <option value = "C#">C#</option>

                     <option value = "Data Base">Data Base</option>

                     <option value = "Hadoop">Hadoop</option>

                     <option value = "VB script">VB script</option>

                  </select>

               </td>

            </tr>

            

            <tr>

               <td>Agree</td>

               <td><input type = "checkbox" name = "checked" value = "1"></td>

               <?php if(!isset($_POST['checked'])){ ?>

               <span class = "error">* <?php echo "You must agree to terms";?></span>

               <?php } ?>

            </tr>

           

            <tr>

               <td>

                  <input type = "submit" name = "submit" value = "Submit">

               </td>

            </tr>

           

         </table>

      </form>

     

      <?php

         echo "<h2>Your given values are as :</h2>";

         echo ("<p>Your name is $name</p>");

         echo ("<p> your email address is $email</p>");

         echo ("<p>Your class time at $course</p>");

         echo ("<p>your class info $class </p>");

         echo ("<p>your gender is $gender</p>");

        

         for($i = 0; $i < count($subject); $i++) {

            echo($subject[$i] . " ");

         }

      ?>

     

   </body>

</html>

PHP – Login Example

PHP login with session

Php login script is used to provide the authentication for our web pages. the Script executes after submitting the user login button.

Login Page

Login page should be as follows and works based on session. If the user close the session, it will erase the session data.

 

<?php

   ob_start();

   session_start();

?>




<?

   // error_reporting(E_ALL);

   // ini_set("display_errors", 1);

?>




<html lang = "en">

  

   <head>

      <title>Tecklearn.com</title>

      <link href = "css/bootstrap.min.css" rel = "stylesheet">

     

      <style>

         body {

            padding-top: 40px;

            padding-bottom: 40px;

            background-color: #ADABAB;

         }

        

         .form-signin {

            max-width: 330px;

            padding: 15px;

            margin: 0 auto;

            color: #017572;

         }

        

         .form-signin .form-signin-heading,

         .form-signin .checkbox {

            margin-bottom: 10px;

         }

        

         .form-signin .checkbox {

            font-weight: normal;

         }

        

         .form-signin .form-control {

            position: relative;

            height: auto;

            -webkit-box-sizing: border-box;

            -moz-box-sizing: border-box;

            box-sizing: border-box;

            padding: 10px;

            font-size: 16px;

         }

        

         .form-signin .form-control:focus {

            z-index: 2;

         }

        

         .form-signin input[type="email"] {

            margin-bottom: -1px;

            border-bottom-right-radius: 0;

            border-bottom-left-radius: 0;

            border-color:#017572;

         }

        

         .form-signin input[type="password"] {

            margin-bottom: 10px;

            border-top-left-radius: 0;

            border-top-right-radius: 0;

            border-color:#017572;

         }

        

         h2{

            text-align: center;

            color: #017572;

         }

      </style>

     

   </head>

              

   <body>

     

      <h2>Enter Username and Password</h2>

      <div class = "container form-signin">

        

         <?php

            $msg = '';

           

            if (isset($_POST['login']) && !empty($_POST['username'])

               && !empty($_POST['password'])) {

                                                            

               if ($_POST['username'] == 'tecklearn' &&

                  $_POST['password'] == '1234') {

                  $_SESSION['valid'] = true;

                  $_SESSION['timeout'] = time();

                  $_SESSION['username'] = 'tecklearn';

                 

                  echo 'You have entered valid use name and password';

               }else {

                  $msg = 'Wrong username or password';

               }

            }

         ?>

      </div> <!-- /container -->

     

      <div class = "container">

     

         <form class = "form-signin" role = "form"

            action = "<?php echo htmlspecialchars($_SERVER['PHP_SELF']);

            ?>" method = "post">

            <h4 class = "form-signin-heading"><?php echo $msg; ?></h4>

            <input type = "text" class = "form-control"

               name = "username" placeholder = "username = tecklearn"

               required autofocus></br>

            <input type = "password" class = "form-control"

               name = "password" placeholder = "password = 1234" required>

            <button class = "btn btn-lg btn-primary btn-block" type = "submit"

               name = "login">Login</button>

         </form>

                                             

         Click here to clean <a href = "logout.php" tite = "Logout">Session.

        

      </div>

     

   </body>

</html>

Logout.php

It will erase the session data.

<?php

   session_start();

   unset($_SESSION["username"]);

   unset($_SESSION["password"]);

  

   echo 'You have cleaned session';

   header('Refresh: 2; URL = login.php');

?>

So, this brings us to the end of blog. This Tecklearn ‘Form Handling in PHP’ blog helps you with commonly asked questions if you are looking out for a job in PHP Programming. If you wish to learn Java and build a career Java Programming domain, then check out our interactive, Java and JEE Training, that comes with 24*7 support to guide you throughout your learning period. Please find the link for course details:

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Introduction to Java

Java Fundamentals
Introduction to Java Basics
Features of Java
Various components of Java language
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Key Benefits of Java

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Installation of Java
Setting up of Eclipse IDE
Components of Java Program
Editors and IDEs used for Java Programming
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Data types, Operations, Compilation process, Class files, Loops, Conditions
Using Loop Constructs
Arrays- Single Dimensional and Multi-Dimensional
Functions
Functions with Arguments

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Object Oriented Programming in Java
Implement classes and objects in Java
Create Class Constructors
Overload Constructors
Inheritance
Inherit Classes and create sub-classes
Implement abstract classes and methods
Use static keyword
Implement Interfaces and use it

Polymorphism, Packages and String Handling

Concept of Static and Run time Polymorphism
Function Overloading
String Handling –String Class
Java Packages

Exception Handling and Multi-Threading

Exception handling
Various Types of Exception Handling
Introduction to multi-threading in Java
Extending the thread class
Synchronizing the thread

File Handling in Java

Input Output Streams
io Package
File Handling in Java

Java Collections

Wrapper Classes and Inner Classes: Integer, Character, Boolean, Float etc
Applet Programs: How to write UI programs with Applet, Java.lang, Java.io, Java.util
Collections: ArrayList, Vector, HashSet, TreeSet, HashMap, HashTable

Java Database Connectivity (JDBC)

Introduction to SQL: Connect, Insert, Update, Delete, Select
Introduction to JDBC and Architecture of JDBC
Insert/Update/Delete/Select Operations using JDBC
Batch Processing Transaction
Management: Commit and Rollback

Java Enterprise Edition – Servlets

Introduction to J2EE
Client Server architecture
URL, Port Number, Request, Response
Need for servlets
Servlet fundamentals
Setting up a web project in Eclipse
Configuring and running the web app with servlets
GET and POST request in web application with demo
Servlet lifecycle
Servlets Continued
Session tracking and filter
Forward and include Servlet request dispatchers

Java Server Pages (JSP)

Fundamentals of Java Server Page
Writing a code using JSP
The architecture of JSP
JSP Continued
JSP elements: Scriptlets, expressions, declaration
JSP standard actions
JSP directives
Introduction to JavaBeans
ServletConfig and ServletContext
Servlet Chaining
Cookies Management
Session Management

Hibernate

Introduction to Hibernate
Introduction to ORM
ORM features
Hibernate as an ORM framework
Hibernate features
Setting up a project with Hibernate framework
Basic APIs needed to do CRUD operations with Hibernate
Hibernate Architecture

POJO (Plain Old Java Object)

POJO (Plain Old Java Object)
Persistent Objects
Lifecycle of Persistent Object

Spring

Introduction to Spring
Spring Fundamentals
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