Php define function
- Php define function inside function
- Php define function if not exists
- Php define function return type
- Php define function parameter type
- Php define function if not defined
- Php define function as variable
- Php define function with optional parameters
- Php define function arguments
- Php define function call
- Php define function error
- Php define global function
- Php define class inside function
- Php define variable for all functions
- Php function define array
- Php define callback function