What is the difference between include, include_once, require, and require_once? include, include_once, require और require_once में क्या अंतर है?

Short Answer

Parameters allow you to pass data into a function so that the function can process that specific data. They act as variables inside the function scope.

Detailed Explanation & Code Example

When you define a function, you can specify one or more parameters inside the parentheses. When you call the function, you pass arguments to match those parameters.

// Defining a function with two parameters: $name and $greeting
function greetUser($name, $greeting) {
    echo "$greeting, $name!";
}

// Calling the function and passing arguments
greetUser("Alice", "Hello"); 
// Output: Hello, Alice!

greetUser("Bob", "Good morning"); 
// Output: Good morning, Bob!

Important Points

In modern PHP (7.0+), it is highly recommended to use Type Declarations to ensure the correct data types are passed to your parameters:

// Enforces that $age must be an integer
function setAge(int $age) {
    // ...
}