PHP Forms and User Input The PHP $_GET and $_POST variables are used to retrieve information from forms, like user input.

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Presentation transcript:

PHP Forms and User Input The PHP $_GET and $_POST variables are used to retrieve information from forms, like user input.

PHP Form Handling 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. Example The example below contains an HTML form with two input fields and a submit button: Name: Age:

When a user fills out the form above and clicks on the submit button, the form data is sent to a PHP file, called "welcome.php": "welcome.php" looks like this: Welcome ! You are years old.

Output could be something like this: Welcome John! You are 28 years old.

PHP $_GET Variable In PHP, the predefined $_GET variable is used to collect values in a form with method="get".

The $_GET Variable The predefined $_GET variable is used to collect values in 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 has limits on the amount of information to send. Example Name: Age:

The "welcome.php" file can now use the $_GET variable to collect form data (the names of the form fields will automatically be the keys in the $_GET array): Welcome. You are years old!

When to use method="get"? When using method="get" in HTML forms, all variable names and values are displayed in the URL. Note: 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 get method is not suitable for very large variable values. It should not be used with values exceeding 2000 characters.

PHP $_POST Function In PHP, the predefined $_POST variable is used to collect values in a form with method="post".

The $_POST Variable The predefined $_POST variable is used to collect values from a form sent 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. Note: However, there is an 8 Mb max size for the POST method, by default (can be changed by setting the post_max_size in the php.ini file). Example Name: Age:

The "welcome.php" file can now use the $_POST variable to collect form data (the names of the form fields will automatically be the keys in the $_POST array): Welcome ! You are years old.

When to use 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. However, because the variables are not displayed in the URL, it is not possible to bookmark the page.