[Solved] What does the nullable type declaration ?string mean when used in a PHP function parameter? — Ans: The parameter can accept a string or null value. | PHP

PHP - Functions

What does the nullable type declaration ?string mean when used in a PHP function parameter?

AThe parameter is optional and defaults to an empty string.

BThe parameter must always be a string and cannot be null.

CThe parameter can accept any data type except null.

DThe parameter can accept a string or null value.

Step-by-Step Solution

Solution:

Step 1: Understand nullable type syntax
The ?string means the parameter can be either a string or null.
Step 2: Interpret the meaning in function parameters
This allows passing a string value or explicitly passing null without error.
Final Answer:
The parameter can accept a string or null value. -> Option D
Quick Check:
Nullable type = string or null [OK]

Quick Trick: Nullable types allow null or the specified type [OK]

Common Mistakes:

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What does the nullable type declaration ?string mean when used in a PHP function parameter?