[Solved] What will be the output of the following PHP code?$a = 0;var_dump(isset($a));var_dump(empty($a));var_dump(is_null($a)); | PHP

PHP - Type Handling

What will be the output of the following PHP code?

$a = 0;
var_dump(isset($a));
var_dump(empty($a));
var_dump(is_null($a));

Abool(true) bool(false) bool(false)

Bbool(false) bool(true) bool(true)

Cbool(false) bool(false) bool(true)

Dbool(true) bool(true) bool(false)

Step-by-Step Solution

Solution:

Step 1: Evaluate isset($a) when $a = 0
$a is set and not null, so isset($a) returns true.
Step 2: Evaluate empty($a) when $a = 0
Zero is considered empty in PHP, so empty($a) returns true.
Step 3: Evaluate is_null($a) when $a = 0
$a is integer zero, not null, so is_null($a) returns false.
Final Answer:
bool(true)
bool(true)
bool(false) -> Option D
Quick Check:
isset true, empty true for 0, is_null false [OK]

Quick Trick: 0 is set and empty, but not null [OK]

Common Mistakes:

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