Which of the following is the correct syntax to assign $result to $a if set, otherwise to 10, using null coalescing?

easy📝 Syntax Q3 of 15

PHP - Conditional Statements

Which of the following is the correct syntax to assign $result to $a if set, otherwise to 10, using null coalescing?

A$result = $a ?: 10;

B$result = $a ?? 10;

C$result = $a ? 10;

D$result = ?? $a 10;

Step-by-Step Solution

Solution:

Step 1: Recall null coalescing syntax
The correct syntax is $variable = $value ?? default; to assign default if value is null or not set.
Step 2: Check each option
$result = $a ?? 10; correctly uses ?? operator. Others are invalid syntax or different operators.
Final Answer:
$result = $a ?? 10; -> Option B
Quick Check:
Correct null coalescing syntax is variable = value ?? default [OK]

Quick Trick: Use variable = value ?? default for null coalescing [OK]

Common Mistakes:

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