Which of the following is the correct syntax to use the null coalescing operator in PHP?

easy📝 Syntax Q12 of 15

PHP - Operators

A$value = $a ??= $b;

B$value = $a ?: $b;

C$value = $a ? $b;

D$value = $a ?? $b;

Step-by-Step Solution

Solution:

Step 1: Identify the null coalescing operator syntax
The operator is written as ?? between two expressions.
Step 2: Check each option
$value = $a ?? $b; uses $a ?? $b which is correct syntax. $value = $a ?: $b; uses the ternary shorthand, not null coalescing. $value = $a ? $b; is incomplete syntax. $value = $a ??= $b; uses ??= which is a different operator (null coalescing assignment).
Final Answer:
$value = $a ?? $b; -> Option D
Quick Check:
Correct null coalescing syntax uses ?? between values [OK]

Quick Trick: Use ?? between two values for null coalescing [OK]

Common Mistakes:

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