[Solved] What will be the output of this PHP code?$a = 9223372036854775807; $b = $a + 1; echo gettype($b); — Ans: "double" | PHP

PHP - Variables and Data Types

What will be the output of this PHP code?

$a = 9223372036854775807;
$b = $a + 1;
echo gettype($b);

A"boolean"

B"integer"

C"string"

D"double"

Step-by-Step Solution

Solution:

Step 1: Understand integer overflow in PHP
When exceeding the platform's max integer size, adding causes overflow and converts to double.
Step 2: Analyze the code
$a is max 64-bit signed int. $b = $a + 1 causes overflow, so $b becomes double. gettype($b) returns "double".
Final Answer:
"double" -> Option D
Quick Check:
Integer overflow converts to float = "double" [OK]

Quick Trick: Integer overflow in PHP converts to float automatically. [OK]

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