PHP $_POST Variable

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

The POST method transfers information via HTTP headers.

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).

  • The POST method does not have any restriction on data size to be sent.

  • The POST method can be used to send ASCII as well as binary data.

  • The data sent by POST method goes through HTTP header so security depends on HTTP protocol. By using Secure HTTP you can make sure that your information is secure.

  • The PHP provides $_POST associative array to access all the sent information using GET method.

Example

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

When the user clicks the "Submit" button, the URL will look like this:

http://www.w3schools.com/welcome.php

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.

 

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.

 

The PHP $_REQUEST Variable

The predefined $_REQUEST variable contains the contents of both $_GET, $_POST, and $_COOKIE.

The PHP $_REQUEST variable can be used to get the result from form data sent with both the GET and POST methods.

Example

Welcome <?php echo $_REQUEST[“fname”]; ?>!<br>
You are <?php echo $_REQUEST[“age”]; ?> years old.

 

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