How is the parameter passing method of PHP functions used in function overloading?

PHP function parameter passing method and usage in function overloading

Function parameter passing method

PHP has two It provides several parameter passing methods.

• Passing by reference (by reference): Uses the address of the passed parameter when calling a function. Modifying a parameter within a function also affects its original value in the caller function.
• By value: Uses a copy of the parameter passed when calling the function. Modifying parameters within a function does not affect their original values ​​in the caller function.

Function overloading

Function overloading allows you to create multiple functions with the same name. It means defining. Each function must have its own parameter list or parameter type.

How to pass function parameters and how to use function overloading

How to pass function parameters You can handle different parameter types in function overloading by using

Practical Examples

A function called find() as follows: Define:

function find($name, $email = null, $phone = null) {
  // 코드...
}

This function treats the name parameter as a value pass, and the email and phone parameters default to the null value. to treat it as passing by reference.

Now you can make calls like:

find("John Doe"); // name 값 전달
find('John Doe', 'john.doe@example.com'); // name 값 전달, email 참조 전달
find("John Doe", null, "123-456-7890"); // name 값 전달, email null, phone 참조 전달

As you can see in the example above, you can use the parameter passing method to pass various parameter types. You can implement function overloading of

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