[Solved] What will be the output of this PHP code?function multiply(?int $a, int $b) { return ($a ?? 1) * $b; } echo multiply(null, 5); | PHP

PHP - Functions

What will be the output of this PHP code?

function multiply(?int $a, int $b) {
    return ($a ?? 1) * $b;
}
echo multiply(null, 5);

A0

B5

CError: Argument 1 must be int or null

Dnull

Step-by-Step Solution

Solution:

Step 1: Understand nullable parameter and null coalescing
The first parameter can be int or null. If null, $a ?? 1 evaluates to 1.
Step 2: Calculate the return value
Since $a is null, it becomes 1, multiplied by 5 equals 5.
Final Answer:
5 -> Option B
Quick Check:
Nullable with ?? provides fallback value [OK]

Quick Trick: Use ?? to replace null with default value [OK]

Common Mistakes:

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