Do I need to generate my own salt with password_hash()?

No. Modern PHP automatically generates a cryptographically secure random salt and embeds it directly into the resulting hash string.

PHP Development

PHP Password Hashing Explained: Bcrypt, Argon2id & Cost Factors

Explore the math behind slow adaptive hashing algorithms. Learn how to calibrate bcrypt cost factors and implement Argon2id for maximum security.

Written by Marcus Thorne

Published: 10/06/2026 7 min read

The Role of Adaptive Key-Stretching Algorithms

Standard hashing functions (SHA-256, SHA-512) are designed for speed, allowing a modern GPU cluster to test billions of guesses per second. Password hashing functions like Bcrypt and Argon2id are intentionally slow and memory-intensive, making offline brute-force attacks computationally infeasible.

Marcus Thorne

Head of Technology & Web Engineering

Marcus is a full-stack engineer and educator who has architected fintech payment gateways, secure authentication engines, and performant data pipelines using modern PHP and MySQL.

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