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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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Page 1: PHP Forms and User Input The PHP $_GET and $_POST variables are used to retrieve information from forms, like user input

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

Page 2: 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:<html><body>

<form action="welcome.php" method="post">Name: <input type="text" name="fname" />Age: <input type="text" name="age" /><input type="submit" /></form>

</body></html>

Page 3: PHP Forms and User Input The PHP $_GET and $_POST variables are used to retrieve information from forms, like user input

• 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:

<html><body>

Welcome <?php echo $_POST["fname"]; ?>!<br />You are <?php echo $_POST["age"]; ?> years old.

</body></html>

Page 4: PHP Forms and User Input The PHP $_GET and $_POST variables are used to retrieve information from forms, like user input

• Output could be something like this:

Welcome John!You are 28 years old.

Page 5: PHP Forms and User Input The PHP $_GET and $_POST variables are used to retrieve information from forms, like user input

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

Page 6: PHP Forms and User Input The PHP $_GET and $_POST variables are used to retrieve information from forms, like user input

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

<form action="welcome.php" method="get">Name: <input type="text" name="fname" />Age: <input type="text" name="age" /><input type="submit" /></form>

Page 7: PHP Forms and User Input The PHP $_GET and $_POST variables are used to retrieve information from forms, like user input

• 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 <?php echo $_GET["fname"]; ?>.<br />You are <?php echo $_GET["age"]; ?> years old!

Page 8: PHP Forms and User Input The PHP $_GET and $_POST variables are used to retrieve information from forms, like user input

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.

Page 9: PHP Forms and User Input The PHP $_GET and $_POST variables are used to retrieve information from forms, like user input

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

Page 10: PHP Forms and User Input The PHP $_GET and $_POST variables are used to retrieve information from forms, like user input

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

<form action="welcome.php" method="post">Name: <input type="text" name="fname" />Age: <input type="text" name="age" /><input type="submit" /></form>

Page 11: PHP Forms and User Input The PHP $_GET and $_POST variables are used to retrieve information from forms, like user input

• 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 <?php echo $_POST["fname"]; ?>!<br />You are <?php echo $_POST["age"]; ?> years old.

Page 12: PHP Forms and User Input The PHP $_GET and $_POST variables are used to retrieve information from forms, like user input

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.


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