PHPUnit 13.2 introduces several improvements focused on precision and clarity. New test ID mechanisms (--list-test-ids, --run-test-id, --test-id-filter-file) allow exact test selection without regex patterns, useful for CI sharding and re-running failures. Test ordering gains duration-descending support and cleaner deprecation of ambiguous ordering values. Diff generation is dramatically faster thanks to Myers' linear-space algorithm in sebastian/diff v9, reducing large-input diffs from tens of seconds to milliseconds. New --diff-context and --compact output options improve readability. Test doubles gain withParameterSetsInPartialOrder(), willReturnStrictMap(), and a clearer exception message API replacing the misleadingly named expectExceptionMessage(). The test runner also handles error handler chaining, output buffering conflicts, and graceful Ctrl-C interrupts more reliably.
