How can one determine if a specific PHP extension, such as curl, is installed on a web hosting platform like cwcity?

To determine if a specific PHP extension like curl is installed on a web hosting platform like cwcity, you can create a PHP script that checks for the existence of the extension using the `extension_loaded` function. If the extension is loaded, the function will return true, indicating that the extension is installed. You can then use this information to handle your code accordingly.

if (extension_loaded('curl')) {
    echo 'The curl extension is installed.';
} else {
    echo 'The curl extension is not installed.';
}