The function_exists() function in PHP is used to check if a ______ has been defined.
- Function
- Variable
- Class
- Constant
The function_exists() function in PHP is used to check if a function has been defined. It takes the function name as a string parameter and returns true if the function exists and is callable. The other mentioned options (Variable, Class, Constant) are not specifically used with the function_exists() function. For more details, refer to the PHP documentation on function_exists(): http://php.net/manual/en/function.function-exists.php
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