Defining and calling functions in PHP Mocktest

The function keyword is used to define a function in PHP.

The syntax for calling a function in PHP is to write the function name followed by parentheses.

Function names in PHP are case-sensitive, meaning that myFunction and MyFunction would be considered different functions.

Parameters in PHP functions are used to specify values that are passed to the function when it is called, allowing the function to work with different data.

Parameters in a PHP function are defined within parentheses after the function name.

The return statement in PHP functions is used to output a value from the function and terminate its execution, returning control to the calling code along with the specified value.

In PHP, functions can have a return type declared using type declarations, which specify the type of value that the function will return.

The output of the code will be 8 because the add() function returns the sum of its two parameters $a and $b, which are 5 and 3 respectively. The returned value is then assigned to the variable $result and echoed.

Default parameter values in PHP functions allow parameters to be optional, meaning that if a value is not provided for a parameter when the function is called, the default value specified in the function definition will be used instead.

The ...$args syntax in PHP is used to declare a variable-length argument list in a function, allowing the function to accept any number of arguments.