You want to check if a variable $x exists and is not null, but also want to treat the value 0 as valid (not empty). Which combination of PHP functions correctly achieves this?

hard📝 Application Q15 of 15

PHP - Type Handling

You want to check if a variable $x exists and is not null, but also want to treat the value 0 as valid (not empty). Which combination of PHP functions correctly achieves this?

Aif (isset($x) && $x !== null) { ... }

Bif (isset($x) && !empty($x)) { ... }

Cif (!is_null($x) && !empty($x)) { ... }

Dif (!empty($x) || isset($x)) { ... }

Step-by-Step Solution

Solution:

Step 1: Understand the requirement
We want to check if $x exists and is not null, but 0 should be valid (not treated as empty).
Step 2: Analyze each option
if (isset($x) && !empty($x)) { ... } fails because empty(0) is true, so 0 would be excluded. if (isset($x) && $x !== null) { ... } checks if $x is set and not null, allowing 0. if (!is_null($x) && !empty($x)) { ... } excludes 0 because of empty($x). if (!empty($x) || isset($x)) { ... } uses OR, which can be true even if $x is empty or null.
Final Answer:
if (isset($x) && $x !== null) { ... } -> Option A
Quick Check:
Use isset and strict null check to allow 0 [OK]

Quick Trick: Use isset and !== null to allow zero values [OK]

Common Mistakes:

Using empty excludes zero values
Using OR instead of AND
Confusing is_null with isset

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You want to check if a variable $x exists and is not null, but also want to treat the value 0 as valid (not empty). Which combination of PHP functions correctly achieves this?

Step 1: Understand the requirement

Step 2: Analyze each option

Final Answer:

Quick Check:

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