php_mt

Bit-for-bit compatible implementation of PHP 7.1+ MT19937 (mt_rand) in Rust.

This crate reproduces the exact output of:

• mt_srand(seed)
• mt_rand()
• mt_rand(min, max)

for PHP 7.1 and newer.

It is intended for deterministic cross-language compatibility and reproducible test vectors — not for cryptographic use.

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Features

• Exact Zend Engine MT19937 constants
• 624-element state array
• 31-bit output for mt_rand() (matches PHP)
• Integer rejection sampling for mt_rand(min, max)
• No floating point scaling
• No external dependencies
• Fully deterministic

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Example

use php_mt::PhpMt;

let mut rng = PhpMt::new(1234);

assert_eq!(rng.mt_rand(), 411284887);
assert_eq!(rng.mt_rand_range(0, 100), 20);