How can you call a user-defined function in PHP using a string variable?
- Use the call_user_func() or call_user_func_array() functions
- Use the execute_function() or execute_user_func() functions
- Use the invoke_function() or invoke_user_func() functions
- Use the run_function() or run_user_func() functions
To call a user-defined function in PHP using a string variable, you can use the call_user_func() or call_user_func_array() functions. These functions allow you to invoke a callback function specified by a string name. The other mentioned options (execute_function(), execute_user_func(), invoke_function(), invoke_user_func(), run_function(), run_user_func()) are not valid PHP functions. For further information, consult the PHP documentation on call_user_func(): http://php.net/manual/en/function.call-user-func.php and call_user_func_array(): http://php.net/manual/en/function.call-user-func-array.php
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