IMAP support for PHP is provided by the "IMAP" extension, which is a built-in extension that comes bundled with most PHP installations. This extension allows PHP scripts to interact with servers that support the Internet Message Access Protocol (IMAP) for retrieving and managing email messages.
To check if the IMAP extension is enabled in your PHP installation, you can create a new PHP file with the following code:
<?php
phpinfo();
?>
Save the file as "info.php" in your web server's document root directory and then access the file in a web browser (e.g. http://example.com/info.php). This will display a detailed report on your PHP installation, including information about the enabled extensions.
Look for the "IMAP" section in the output of the phpinfo() function. If the extension is installed and enabled, you should see a table with information about the IMAP module, including the version number and the configuration settings. If the IMAP extension is not enabled, you'll need to install and enable it on your server before you can use it in your PHP scripts.
Note that the process for enabling the IMAP extension may vary depending on your operating system and web server configuration. Consult your server documentation or online resources for specific instructions on how to enable the extension for your platform.