What are some methods in PHP to gather information about functions?

To gather information about functions in PHP, you can use built-in functions like `function_exists()`, `get_defined_functions()`, and `ReflectionFunction`. These functions allow you to check if a function exists, retrieve a list of all defined functions, and get detailed information about a specific function, respectively. 

// Check if a function exists
if (function_exists('my_function')) {
    echo 'Function my_function exists';
} else {
    echo 'Function my_function does not exist';
}

// Get a list of all defined functions
$defined_functions = get_defined_functions();
print_r($defined_functions);

// Get detailed information about a function
$reflection = new ReflectionFunction('my_function');
echo $reflection->getName();
echo $reflection->getFileName();
echo $reflection->getStartLine();

Keywords

reflection get_defined_functions get_defined_vars debug_backtrace phpinfo

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