Sep 18, 2026 · Backend Development

PHP Weak Typing Pitfalls: Secure Comparison Templates & Input Validation Code

This article details five critical PHP weak typing vulnerabilities — loose equality, empty() misuse, in_array/switch type juggling, and 0e hash collisions — and provides production-ready secure comparison templates, strict input validation functions, and a pre-deployment checklist to prevent authentication bypasses and data corruption.

PHPSecuritydeclare strict_types

0 likes · 6 min read

PHP Weak Typing Pitfalls: Secure Comparison Templates & Input Validation Code

Laravel Tech Community

May 9, 2021 · Backend Development

hash_equals() – Constant‑Time String Comparison to Prevent Timing Attacks

The article explains PHP's hash_equals() function, which performs a constant‑time comparison of two strings to mitigate timing attacks, describes its parameters and return value, and provides example code demonstrating correct and incorrect usage with crypt() hashes.

PHPSecurityhash_equals

0 likes · 2 min read

hash_equals() – Constant‑Time String Comparison to Prevent Timing Attacks