PHP - Functions
Which of the following is the correct nullable type syntax to declare a function parameter that accepts a nullable string in PHP?
Which of the following is the correct nullable type syntax to declare a function parameter that accepts a nullable string in PHP?
easy📝 Syntax Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Recall nullable type syntax in PHP
Nullable types use a question mark?before the type, like?string.Step 2: Check each option's syntax
function greet(?string $name) {} uses?stringcorrectly. function greet(string|null $name) {} uses union type syntax which is valid in PHP 8+, but the question asks for nullable syntax specifically. Options C and D are invalid syntax.Final Answer:
function greet(?string $name) {} -> Option CQuick Check:
Nullable syntax = ?type before parameter [OK]
Quick Trick: Use ? before type for nullable, not after or inside parentheses [OK]
Common Mistakes:
- Placing ? after the type name
- Using union type syntax instead of nullable syntax
- Misplacing the question mark in parameter
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