Which PHP function can be used to check if a function has been defined?
- function_exists()
- method_exists()
- class_exists()
- is_function_defined()
The function_exists() function in PHP can be used to check if a function has been defined. It returns true if the function exists and is callable. The other mentioned options (method_exists(), class_exists(), is_function_defined()) 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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