What are some common uses of the function_exists() function in PHP?
- Checking if a function is available before calling it
- Providing fallback functionality for unsupported PHP versions
- Implementing conditional code based on the availability of a function
- All of the above
The function_exists() function in PHP is commonly used to check if a function is available before calling it. It helps ensure that the code is compatible with different PHP versions and avoids calling non-existing functions. It is also used to provide fallback functionality for unsupported PHP versions or to implement conditional code based on the availability of a function. All of the mentioned options are common uses of the function_exists() function in PHP. For further information, consult the PHP documentation on function_exists(): http://php.net/manual/en/function.function-exists.php
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