21CTO

Sep 16, 2026 · Backend Development

PHP 8.6 Preview: Partial Function Application, clamp(), Duration & Polling API

PHP 8.6, slated for November 19, 2026, introduces partial function application with ? and ... placeholders, a clamp() function for value bounding, a Time\Duration class with nanosecond precision, readonly property defaults, parameter doc comments, an Io\Poll API for I/O multiplexing, SortDirection enum, enum __debugInfo(), unified stream error handling, URI builder enhancements, and stricter session security defaults.