ph-echo-hot — echo/fwrite each iter vs implode once
Claim
Measured on this machine: primary hot case echo_each_iter ratio before/after ~21.31× (faster after). Default severity stays hint. Do not escalate to error from this fill alone.
How measured
- Harness:
packages/phpperf/examples/bench/evidence_ph001_ph003.php - Protocol: warm=3; median of 9 rounds; GC/collect where applicable
- Raw lines:
ph-echo-hot.jsonl
Runtime (this evidence file)
| Field | Value |
|---|---|
| When | 2026-10-23 Asia/Shanghai (machine clock; JSONL ts is UTC) |
| Toolchain | PHP 8.5.12 |
Median after (implode_once) | 0.575792 ms (ops=20000, ratio=1.000000) |
Median before (echo_each_iter) | 12.272208 ms (ops=20000, ratio=21.313613) |
| Primary ratio before/after | ~21.31× (echo_each_iter) |
Direction and absolute ms are N/machine/opt-sensitive. Re-run the harness after toolchain or machine changes.
Lint mapping
phpperf-lint ph-echo-hot default stays hint. Escalate recommended: no.
Limits
- Microbench; not an app profile.
- Small-N rows may sit near timer noise; prefer hot (non-small) cases for ratio claims.
- I/O rules (print/echo/puts/writeln) discard to
/dev/null— env-dependent.