Tencent Cloud Developer

May 23, 2024 · Backend Development

How WeChat Red‑Packet Random Algorithms Work: Simple Random, Double‑Mean & Segment Split

This article examines the main algorithms behind WeChat's red‑packet distribution—plain random, double‑mean, and segment‑split (including an optimized version), explains their PHP implementations, validates array_rand's randomness, and compares their performance and fairness through code examples and timing tests.