The function_exists() function in PHP is used to check if a function has been defined.
- Function
- Variable
- Class
- Constant
The function_exists() function in PHP is used to check if a function has been defined. By passing the function name as a string parameter, the function checks if the function exists and is callable, returning true if it does. 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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