[Solved] What will be the output of this PHP code?function checkAge(?int $age) { if ($age === null) { return "Age not provided"; } return "Age is $age"; } echo checkAge(null); | PHP

PHP - Functions

What will be the output of this PHP code?

function checkAge(?int $age) {
    if ($age === null) {
        return "Age not provided";
    }
    return "Age is $age";
}

echo checkAge(null);

AAge not provided

BAge is

CError: Argument must be int

DAge is null

Step-by-Step Solution

Solution:

Step 1: Understand nullable parameter and null check
The function accepts an ?int, so null is allowed. It checks if $age === null and returns "Age not provided".
Step 2: Call the function with null
Calling checkAge(null) triggers the null check, so it returns "Age not provided".
Final Answer:
Age not provided -> Option A
Quick Check:
Nullable param null input returns null check message [OK]

Quick Trick: Check for null explicitly when using nullable types [OK]

Common Mistakes:

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