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deepmind.google·6d ago
AI Engineering
Lobsters·13d ago·5 min read
log is non-monotonous in PHP and Lua
TL;DR
PHP exhibits non-monotonous behavior in logarithmic calculations under specific conditions, leading to unexpected results. This can cause assertions about numerical comparisons to fail in rare cases.
✦ Why It Matters
Review your PHP code for potential floating-point comparison issues to prevent assertion failures.
Key Takeaways
- Be cautious with floating-point comparisons in PHP.
- Test edge cases involving logarithmic functions.
- Use precise numerical values to avoid unexpected results.
- Review assertions in your code for potential failures.
How It Works
PHP's logarithmic function can yield unexpected results due to the way it handles floating-point numbers, particularly when the base is very close to a whole number.