Named arguments in PHP - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are named arguments in PHP?

Named arguments allow you to pass values to a function by specifying the parameter name, not just the order. This makes code clearer and lets you skip optional parameters.

beginner

How do named arguments improve function calls?

They improve readability by showing which value goes to which parameter. They also let you pass arguments in any order and skip optional ones.

beginner

Show an example of calling a PHP function with named arguments.

Example:<br><code>function greet(string $name, string $greeting = "Hello") {<br>  echo "$greeting, $name!";<br>}<br>greet(name: "Alice", greeting: "Hi");</code>

intermediate

Can you mix positional and named arguments in PHP function calls?

Yes, but positional arguments must come first. After that, you can use named arguments in any order.

intermediate

What happens if you use a named argument that does not exist in the function?

PHP will throw a fatal error because the function does not have a parameter with that name.

Which of the following is a correct way to call a function with named arguments in PHP?

A foo(bar: 10, baz: 20);

B foo(10: bar, 20: baz);

C foo(bar = 10, baz = 20);

D foo(10, 20);

Named arguments use the syntax parameterName: value, like bar: 10.

Can you skip optional parameters when using named arguments in PHP?

A Only if the function has no default values.

B No, you must pass all parameters in order.

C Only if the parameters are at the end.

D Yes, by naming only the parameters you want to pass.

Named arguments let you skip optional parameters by naming only those you want to pass.

What is the rule about mixing positional and named arguments in PHP?

A Positional arguments must come before named arguments.

B Named arguments must come before positional arguments.

C You cannot mix positional and named arguments.

D Order does not matter.

Positional arguments must be listed first, then named arguments can follow in any order.

What error occurs if you use a named argument that does not match any parameter?

A The function uses the default value.

B A fatal error is thrown.

C The argument is ignored.

D A warning is shown but code runs.

PHP throws a fatal error if a named argument does not match any parameter.

Which PHP version introduced named arguments?

A PHP 7.0

B PHP 7.4

C PHP 8.0

D PHP 5.6

Named arguments were introduced in PHP 8.0.

Explain how named arguments work in PHP and why they are useful.

Think about how naming parameters helps understand code better.

Describe the rules for mixing positional and named arguments in PHP function calls.

Remember the order and naming rules.