How can the get_defined_functions() function be used to identify function calls in an included PHP file?

To identify function calls in an included PHP file, we can use the get_defined_functions() function to retrieve a list of all defined functions in the current script. By comparing this list with the functions called in the included file, we can identify which functions are being called. This can be useful for debugging or analyzing the functionality of the included file.

// Include the PHP file
include 'included_file.php';

// Get a list of all defined functions
$defined_functions = get_defined_functions()['user'];

// Iterate through the defined functions and check if they are called in the included file
foreach ($defined_functions as $function) {
    if (strpos(file_get_contents('included_file.php'), $function) !== false) {
        echo "Function $function is called in the included file." . PHP_EOL;
    }
}