PHP - Type Handling
Which of the following is the correct syntax to check if a variable
$var is not null in PHP?Which of the following is the correct syntax to check if a variable $var is not null in PHP?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Understand how to check not null
To check if variable is not null, compare it directly with null using !== operator.Step 2: Analyze options
is_null($var) checks if null (not not null), !isset($var) checks if variable is not set or null, empty() checks for many falsy values.Final Answer:
if ($var !== null) -> Option AQuick Check:
Not null check = $var !== null [OK]
Quick Trick: Use !== null to check variable is not null [OK]
Common Mistakes:
- Using is_null() instead of negation
- Confusing isset() with null check
- Using empty() for null check
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