When Should I Use 64-Bit Integers in PHP?

Need for 64-Bit Integers in PHP

PHP integers typically have a width of 32 bits, limiting the maximum integer value to around 2^31 (approximately 2 billion). This may not be sufficient for certain applications that require handling large numbers.

Availability of 64-Bit Integers

In PHP, native 64-bit integers are only available if both the hardware and PHP version support them.

Hardware Requirements

To use 64-bit integers, you need to have a 64-bit CPU and operating system.

PHP Version Requirements

The 64-bit version of PHP is required to work with 64-bit integers. Ensure that you are running a 64-bit PHP build.

Verification

To verify the integer size, run the following PHP code:

<?php
echo PHP_INT_MAX;

On 32-bit hardware, you will get an output of around 2^31, while on 64-bit hardware, you will get an output close to 2^63.

Example

The following code illustrates how to use 64-bit integers in PHP:

<?php
// Require 64-bit PHP and hardware
if (PHP_INT_SIZE != 8) {
    throw new Exception("Platform does not support 64-bit integers.");
}

// Create a 64-bit integer
$largeInt = 10000000000000000000; // 16 zeroes for 64-bit

// Output the integer
echo "$largeInt\n";

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