<?php /*   this plugin introduces markup for footnotes, use it like:      ...      some very scientific sentence {{this is a footnote explaination}}      ...   this may be useful in some rare cases; usually one should create   a WikiLink to explain a more complex task on another page;   your decision*/  $ewiki_plugins["format_source"][] = "ewiki_format_source_footnotes";function ewiki_format_source_footnotes (&$source) {   $notenum = 0;   $l = 0;   while (            ($l = strpos($source, "{{", $l))        &&  ($r = strpos($source, "}}", $l))         )   {      $l += 2;      #-- skip "{{...\n...}}"      if (strpos($source, "\n", $l) < $r) {         continue;      }      $notenum++;      #-- extract "footnote"      $footnote = substr($source, $l, $r - $l);      #-- strip "{{footnote}}"      $source = substr($source, 0, $l - 2)             . "<a href=\"#fn$notenum\">