phpperf evidence benches

这篇还没有中文，下面是英文原文。

• evidence_ph001_ph003.php — regenerates ../../evidence/ph-string-dot-hot.jsonl and ../../evidence/ph-echo-hot.jsonl (same timer protocol).
  • Env: PH001_N, PH001_N_SMALL, PH003_N, PH_ROUNDS, PH_WARM, EVIDENCE_DIR.
• evidence_ph002.php — regenerates ../../evidence/ph-array-merge-rebind.jsonl (PHP hrtime(true) wall, warm=3, median of 9).
  • Env: PH002_N_SCALAR, PH002_N_CHUNK, PH002_CHUNK_LEN, PH002_N_SMALL, PH002_ROUNDS, PH002_WARM, EVIDENCE_DIR.