Passing variables between pages

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Presentation transcript:

Passing variables between pages Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

Summary of the previous lecture Operators in PHP Conditional Statements in PHP Looping Statements Arrays in PHP Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan. Department of Computer Science, CIIT Islamabad.

Outline Super Global variables Passing form data Passing data with sessions Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan. Department of Computer Science, CIIT Islamabad.

1. Passing form data Forms provide a mean of submitting information from the client to the server We can create HTML forms using <form> tag Method and action are the most common attributes of <form> Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

1. Passing form data… action - gives the URL of the application that is to receive and process the forms data method - sets the HTTP method that the browser uses to send the form's data to the server for processing most common methods are POST or GET Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

1. Passing form data… Get method : all form data is encoded into the URL, appended the action URL as query string parameters Asad asd@gmail.com submit Value entered by user Action page name Input field name Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

1. Passing form data… Post method: form data appears within the message body of the HTTP request Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

1.1 Super Global Variables PHP automatically makes few variables available in your program These are array variables and can be accessed by name These variables are called super-global variables because they can be accessed without regard to scope Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

1.1 Super Global Variables… $_GET: contains all the query string variables that were attached to the URL $_POST: contains all the submitted form variables and their data Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

1.1 Super Global Variables… <body> <form method=“get” action=“action.php”> <input type=“text” name=“name”> <input type=“text” name=“email”> <input type=“submit”> </form> </body> Asad asd@gmail.com submit name email $_GET Asad asd@gmail.com Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

1.1 Super Global Variables… <body> <form method=“post”> <input type=“text” name=“name”> <input type=“text” name=“email”> <input type=“submit”> </form> </body> Asad asd@gmail.com submit $_POST Asad asd@gmail.com name email Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

1.2 Accessing form data on action page name email $_GET Asad asd@gmail.com Ation.php <?php $name = $_GET[‘name’]; $email = $_GET[‘email’]; ?> Asad asd@gmail.com submit Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

1.2 Accessing form data on action page… name email $_POST Asad asd@gmail.com Ation.php <?php $name = $_POST[‘name’]; $email = $_POST[‘email’]; ?> Asad asd@gmail.com submit Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

2. Passing text field data Post Method Text field Text field name Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

2. Passing text field data… Data is received Display a message Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

2. Passing text field data… We are at form page We are on action page Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

2. Passing hidden field data… Hidden value Field name Accessing hidden value Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

2. Passing hidden field data… Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

2.3 Getting value from checkbox name value label Getting value of ‘C’ Getting value of ‘VB’ Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

2.3 Getting value from checkbox… Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

2.3 Getting value from checkbox… Checking for value of C Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

2.4 Getting value from radio button Same name Value is set Value is not set Getting value of radio Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

2.4 Getting value from radio button… Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

2.5 Getting value from select list Name of the list Option and value Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

2.5 Getting value from select list… Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

3. Passing variables using sessions A session is basically a temporary set of variables that exists only until the browser has shut down $_SESSION: represents data available to a PHP script that has previously been stored in a session Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

3. Passing variables using sessions… name email $_SESSION Asad asd@gmail.com First page <?php $_SESSION[‘name ‘] =‘Asad’; ?> 2nd page <?php echo $_SESSION[‘name ‘]; $_SESSION[‘email ‘] =‘asd@gmail.com’; ?> nth page <?php echo $_SESSION[‘name ‘]; echo $_SESSION[‘email ‘]; ?> ……. Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

3. Passing variables using sessions session_start()- is used to start a session $_SESSION[‘variable_name’]- is used to store data in session variable session_destroy()- is used to destroy a session unset($_SESSION[‘variable_name’])- is used to unset a specific variable Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

3. Passing variables using sessions… Session starts Session variable is created Link to the next page Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

3. Passing variables using sessions… Session starts Session variable is accessed link Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

3. Passing variables using sessions… Session variable’s value Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

3. Passing variables using sessions… Session is destroyed Session is accessed Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

3. Passing variables using sessions… Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

Summary Super global variables Passing data with forms Using session variables Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.

References Chapter 2, “Beginning PHP6,Apache,Mysql web development” by Matt Doyle, Wrox publishers, 2009, ISBN: 0470413964 Chapter 13, “Beginning PHP and MySQL” by W. Jason Gilmore, Apress publisher, 4th edition; 2010, ISBN-13 (electronic): 978-1-4302-3115-8. Basharat Mahmood, Department of Computer Science,CIIT,Islamabad,Pakistan.