PHP Function Arguments

PHP functions become more powerful when you **pass arguments** to them. Arguments allow you to provide input values that the function can process and return a result. This makes functions more flexible and reusable!

🔹 What Are Function Arguments?

Arguments are values passed to a function when calling it. They are defined inside parentheses () after the function name.

📝 Example 1: Function with One Argument

Let’s create a function that accepts a name and displays a greeting.

<?php
function greet($name) {
    echo "Hello, $name! Welcome to PHP.";
}

greet("Alice"); // Passing "Alice" as an argument
?>

Explanation:

• The function greet($name) accepts one argument, $name.
• When calling greet("Alice"), $name takes the value “Alice”.
• The function then prints **”Hello, Alice! Welcome to PHP.”**

📝 Example 2: Function with Multiple Arguments

A function can accept multiple arguments by separating them with commas.

<?php
function add($a, $b) {
    echo "Sum: " . ($a + $b);
}

add(5, 7); // Passing two arguments
?>

Explanation:

• The function add($a, $b) accepts two arguments.
• Calling add(5, 7) passes the values 5 and 7.
• The function calculates and prints **”Sum: 12″.**

📝 Example 3: Function with Default Arguments

If no argument is provided, a default value is used.

<?php
function greetUser($name = "Guest") {
    echo "Hello, $name!";
}

greetUser(); // Uses default value "Guest"
greetUser("Bob"); // Overrides the default value
?>

Explanation:

• If no argument is passed, $name defaults to **”Guest”**.
• If an argument is provided (e.g., "Bob"), it replaces the default value.

🎯 Key Takeaways

• Function **arguments** allow input values to be passed and processed.
• **Multiple arguments** can be passed by separating them with commas.
• **Default values** are used when an argument is not provided.

📝 Practice Time!

Try modifying these examples and experiment with different values to see how function arguments work!