You need to check if a function has been defined in your PHP script. How would you do this?
- Use the function_exists() function
- Use the method_exists() function
- Use the class_exists() function
- Use the is_callable() function
To check if a function has been defined in PHP, you can use the function_exists() function. It returns true if the function exists and is callable. The other mentioned options (method_exists(), class_exists(), is_callable()) are used for different purposes and are not specifically used to check if a function has been defined. For more details, refer to the PHP documentation on function_exists(): http://php.net/manual/en/function.function-exists.php
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