Can a function have no return statement?
If no return statement appears in a function definition, control automatically returns to the calling function after the last statement of the called function is executed. In this case, the return value of the called function is undefined.
Does PHP function need return?
PHP functions do not need to return anything, and I doubt it would negatively affect the performance if you didn’t return anything. If anything, it would positively affect the performance.
What is return statement in function in PHP?
The return keyword ends a function and, optionally, uses the result of an expression as the return value of the function. If return is used outside of a function, it stops PHP code in the file from running.
What is the return type of a function that doesn’t return anything in PHP?
In PHP a function which doesn’t return anything will implicitly return null . This means that you cannot ever actually return nothing*.
Which function must not use a return statement?
In lieu of a data type, void functions use the keyword “void.” A void function performs a task, and then control returns back to the caller–but, it does not return a value. You may or may not use the return statement, as there is no return value.
What is function with no argument and no return value?
Example 1: No Argument Passed and No Return Value The return type of the function is void .
Should functions always return?
NO, a function does not always have to have an explicit return statement. If the function doesn’t need to provide any results to the calling point, then the return is not needed. However, there will be a value of None which is implicitly returned by Python.
Is echo the same as return?
Echo is for display, while return is used to store a value, which may or may not be used for display or other use.
How do you return a value from a function in PHP?
A function can return a value using the return statement in conjunction with a value or object. return stops the execution of the function and sends the value back to the calling code. You can return more than one value from a function using return array(1,2,3,4).
What should we use if a function not return any value?
If a function is not returning any values, then we use void as the return type. Void functions do not return a value after the function executes but they are used similarly like value-returning functions.
Can I return null in PHP?
As of PHP 7.1 you can specify a nullable return type with a question mark in front of the return type. This means that you can either return an integer or a null value. Note that not returning anything also technically means returning a null value.
Is the return statement mandatory for every function?
Every function must have at least one return statement. A procedure is not required to have any return statements. The expression in a function’s return statement must evaluate to a type that matches the return type in the function’s declaration. Example program illustrating both types of return statement.
Why return statement is not necessary when function is called by reference?
For a function of return type void , a return statement is not strictly necessary. If the end of such a function is reached without encountering a return statement, control is passed to the caller as if a return statement without an expression were encountered.
What does no return value mean?
It means that that function does not return a value to the caller explicitly.
What will be the output if return has no argument?
If the return has no argument, None will be displayed as the last statement of the output.
How do you make a function not return None?
Python will have the function return None if you don’t specify a return value for the given input. Python doesn’t work like that. You can ignore the None , but you can’t prevent the interpreter from returning it. Just call the function conditionally.
Why do we need return value?
Generally, a return value is used where the function is an intermediate step in a calculation of some kind. You want to get to a final result, which involves some values that need to be calculated by a function.
What is the difference between PHP echo and PHP return in function?
What does it mean when a function returns a variable?
You are trying to use a variable defined inside the function scope. Show activity on this post. Returning a variable doesn’t mean that it affects that variable globally, it means the function call evaluates to that value where it’s used. Show activity on this post.
How do I return values from a function?
Values are returned by using the optional return statement. Any type may be returned, including arrays and objects. This causes the function to end its execution immediately and pass control back to the line from which it was called.
What type of data can be returned from a function?
Any type may be returned, including arrays and objects. This causes the function to end its execution immediately and pass control back to the line from which it was called. See return for more information.
What happens if the return is omitted from a function?
If the return is omitted the value null will be returned. echo square(4); // outputs ’16’. A function can not return multiple values, but similar results can be obtained by returning an array.