"Be more discrete." declared matt in [3155], and since then, "Silence is Golden" has been the calling card of placeholder index files. Historically, these have been php files, but [43012] changed that and added index.html files for privacy export generated folders.
The php silence files produce no visible content. This adds consistency with these new html files in that there will be no visible content. Silence will fall when the question is asked.
Fixes#44195.
Props audrasjb, rafsuntaskin, Ov3rfly, johnbillion, pento
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