Works like a charm.
Also it add automatic ids for your tags, for automatic linking.
Demo here: http://assist-software.net/blog/qualsyst-iso-management-application
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function create_automatic_toc($content) { preg_match_all( '/<h([1-6])(.*)>([^<]+)<\/h[1-6]>/i', $content, $matches, PREG_SET_ORDER ); global $anchors; $anchors = array(); $toc = '<ul class="toc">'."\n"; $i = 0; foreach ( $matches as $heading ) { if ($i == 0) $startlvl = $heading[1]; $lvl = $heading[1]; $ret = preg_match( '/id=[\'|"](.*)?[\'|"]/i', stripslashes($heading[2]), $anchor ); if ( $ret && $anchor[1] != '' ) { $anchor = stripslashes( $anchor[1] ); $add_id = false; } else { $anchor = preg_replace( '/\s+/', '-', preg_replace('/[^a-z\s]/', '', strtolower( $heading[3] ) ) ); $add_id = true; } if ( !in_array( $anchor, $anchors ) ) { $anchors[] = $anchor; } else { $orig_anchor = $anchor; $i = 2; while ( in_array( $anchor, $anchors ) ) { $anchor = $orig_anchor.'-'.$i; $i++; } $anchors[] = $anchor; } if ( $add_id ) { $content = substr_replace( $content, '<h'.$lvl.' id="'.$anchor.'"'.$heading[2].'>'.$heading[3].'</h'.$lvl.'>', strpos( $content, $heading[0] ), strlen( $heading[0] ) ); } $ret = preg_match( '/title=[\'|"](.*)?[\'|"]/i', stripslashes( $heading[2] ), $title ); if ( $ret && $title[1] != '' ) $title = stripslashes( $title[1] ); else $title = $heading[3]; $title = trim( strip_tags( $title ) ); if ($i > 0) { if ($prevlvl < $lvl) { $toc .= "\n"."<ul>"."\n"; } else if ($prevlvl > $lvl) { $toc .= '</li>'."\n"; while ($prevlvl > $lvl) { $toc .= "</ul>"."\n".'</li>'."\n"; $prevlvl--; } } else { $toc .= '</li>'."\n"; } } $j = 0; $toc .= '<li><a href="#'.$anchor.'">'.$title.'</a>'; $prevlvl = $lvl; $i++; } unset( $anchors ); while ( $lvl > $startlvl ) { $toc .= "\n</ul>"; $lvl--; } $toc .= '</li>'."\n"; $toc .= '</ul>'."\n"; return array( 'toc' => $toc, 'content' => $content ); } |
Source: http://www.westhost.com/contest/php/function/create-table-of-contents/124