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With '/' */ $re = array('#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#'); for($n=1; $n>0; $abs=preg_replace($re, '/', $abs, -1, $n)) {} /* absolute URL is ready! */ left_rib_x = thickness * 2; right_rib_x = width_mm - col_right + tolerance*4 + 2; // Website.

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