Chapter 07 php forms handling
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This document discusses PHP form handling. It explains that the $_GET and $_POST variables are used to retrieve information from forms. It provides an example of a basic HTML form that sends data to a PHP file using the GET and POST methods. The differences between GET and POST are explained, including that GET values are visible in the URL while POST values are not. The document also covers validating user input and using arrays to store and check login credentials.
Chapter 07 php forms handling
- 1. PHP Form HandlingPHP Form Handling Chapter 7 MOHAMAD RAHIMI MOHAMAD ROSMAN
- 2. PHP Forms and User InputPHP Forms and User Input The PHP $_GET and $_POST variables are used to retrieve information from forms, like user input. The most important thing to notice when dealing with HTML forms and PHP is that any form element in an HTML page will automatically be available to your PHP scripts. MOHAMAD RAHIMI MOHAMAD ROSMAN
- 3. ExampleExample Create 2 new text document. Rename the document to index.php and welcome.php Open the index.php MOHAMAD RAHIMI MOHAMAD ROSMAN
- 4. Step 1: Write Form scriptStep 1: Write Form script MOHAMAD RAHIMI MOHAMAD ROSMAN The example HTML page above contains two input fields and a submit button. When the user fills in this form and click on the submit button, the form data is sent to the "welcome.php" file.
- 5. Step 2: Write PHP CodeStep 2: Write PHP Code MOHAMAD RAHIMI MOHAMAD ROSMAN Then, copy both file, paste into www folder, and start the website. What kind of output do you get?
- 6. Form ValidationForm Validation User input should be validated on the browser whenever possible (by client scripts (JavaScript)). Browser validation is faster and you reduce the server load. You should consider using server validation if the user input will be inserted into a database. A good way to validate a form on the server is to post the form to itself, instead of jumping to a different page. The user will then get the error messages on the same page as the form. This makes it easier to discover the error. MOHAMAD RAHIMI MOHAMAD ROSMAN
- 7. The $_GET VariableThe $_GET Variable The $_GET variable is an array of variable names and values sent by the HTTP GET method. The $_GET variable is used to collect values from a form with method="get". Information sent from a form with the GET method is visible to everyone (it will be displayed in the browser's address bar) and it has limits on the amount of information to send (max. 100 characters). MOHAMAD RAHIMI MOHAMAD ROSMAN
- 8. The $_GET VariableThe $_GET Variable When using the $_GET variable all variable names and values are displayed in the URL. So this method should not be used when sending passwords or other sensitive information! However, because the variables are displayed in the URL, it is possible to bookmark the page. This can be useful in some cases. Note: The HTTP GET method is not suitable on large variable values; the value cannot exceed 100 characters. MOHAMAD RAHIMI MOHAMAD ROSMAN
- 9. ExampleExample Create new text document. Rename it to index.php and welcome.php Open index.php and write the following code. MOHAMAD RAHIMI MOHAMAD ROSMAN
- 10. Step 1: Write Form ScriptStep 1: Write Form Script The code is just similar to previous method, just change the POST to GET MOHAMAD RAHIMI MOHAMAD ROSMAN
- 11. Step 2Step 2 Try to work on your own on how to retrieve the values. Refer to previous welcome.php for clue. MOHAMAD RAHIMI MOHAMAD ROSMAN This is the address bar with $_GET method
- 12. The $_POST VariableThe $_POST Variable The $_POST variable is an array of variable names and values sent by the HTTP POST method. The $_POST variable is used to collect values from a form with method="post". Information sent from a form with the POST method is invisible to others and has no limits on the amount of information to send. MOHAMAD RAHIMI MOHAMAD ROSMAN This is the address bar with $_POST method
- 13. Why use $_POST?Why use $_POST? Variables sent with HTTP POST are not shown in the URL Variables have no length limit However, because the variables are not displayed in the URL, it is not possible to bookmark the page. MOHAMAD RAHIMI MOHAMAD ROSMAN
- 15. For this exercise, you can used the following functions: ◦ Array – to store username and password ◦ Looping- to compare password ◦ PHP Form Handling – to get username and password from users. MOHAMAD RAHIMI MOHAMAD ROSMAN
- 16. 11stst StepStep 1st Step ◦ Create a form, like the picture below. You can name the file as index.php MOHAMAD RAHIMI MOHAMAD ROSMAN
- 17. 22ndnd StepStep Username Password Admin Admin User 1234 Guest Guest MOHAMAD RAHIMI MOHAMAD ROSMAN •Now, create a second PHP file. Name it “process.php”. •Then, create an array, consisting of the information in the above table.
- 18. MOHAMAD RAHIMI MOHAMAD ROSMAN PHP Form Handling Use array, looping and if..else statement
- 19. OutPutOutPut POST n GET MOHAMAD RAHIMI MOHAMAD ROSMAN