[Solved] What does a nullable type declaration like ?int mean in a PHP function parameter? — Ans: The parameter can be either an integer or null. | PHP

PHP - Functions

What does a nullable type declaration like ?int mean in a PHP function parameter?

AThe parameter is optional and defaults to zero.

BThe parameter can be either an integer or null.

CThe parameter can be any type except integer.

DThe parameter must always be an integer, never null.

Step-by-Step Solution

Solution:

Step 1: Understand nullable type syntax
The ? before int means the parameter can accept null or an int value.
Step 2: Interpret the meaning in function parameters
This allows the function to safely accept missing or empty values represented by null.
Final Answer:
The parameter can be either an integer or null. -> Option B
Quick Check:
Nullable type = int or null [OK]

Quick Trick: Nullable means type or null allowed, check for ? before type [OK]

Common Mistakes:

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What does a nullable type declaration like ?int mean in a PHP function parameter?