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. $rel; } /* absolute URL */ $abs = "$host$path/$rel"; /* replace '//' or '/./' or '/foo/../' with '/' */ $re = array( '#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#' ); for ($n = 1; $n > 0; $abs = "$host$path/$rel"; function rel2abs($rel, $base) { if (parse_url($rel, PHP_URL_SCHEME) != '' || substr($rel, 0, 2) == '//') { return 2; } } } } // draw a "vertical" wall to mount a circuit outside the full dev board (in some cases) Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢.

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