[Solved] What will be the output of this PHP code?function greet(?string $name) { return $name ?? 'Guest'; } echo greet(null); | PHP

PHP - Functions

What will be the output of this PHP code?

function greet(?string $name) {
    return $name ?? 'Guest';
}
echo greet(null);

AError: Argument must be string

BGuest

Cnull

DEmpty string

Step-by-Step Solution

Solution:

Step 1: Understand the nullable parameter and null coalescing operator
The function accepts a string or null. If null is passed, $name ?? 'Guest' returns 'Guest'.
Step 2: Analyze the function call with null
Calling greet(null) triggers the null coalescing operator to return 'Guest'.
Final Answer:
Guest -> Option B
Quick Check:
Nullable param with ?? operator returns default [OK]

Quick Trick: Use ?? to provide default for null values [OK]

Common Mistakes:

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