What is the function return value type?

The function name of a function is both a representative of the function and a variable. Since the function name variable is usually used to return the function's processing result data to the calling function, that is, a recursive call, the function name variable is generally called the return value. The return value type of the function is specified when the function is defined.

The return value type of a function is specified when the function is defined. The type of the expression in the return statement should be consistent with the return value type specified when defining the function. If they are inconsistent, the return value type when the function is defined shall prevail, and the type of the expression in the return statement will be automatically converted before returning it to the calling function.

Return value in php: The

value is returned by using the optional return statement. Any type can be returned, including lists and objects. This causes the function to immediately end its execution and pass control back to the line on which it was called.

Usage of return():

<?php
function square($num)
{
return $num * $num;
}
echo square(4); // outputs &#39;16&#39;.

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