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Truncate text preserving keywords

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This function truncates text preserving the keyords specified, usefull for search results that should highlight found words.

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  1. //$h = text
  2. //$n = keywords to find separated by space
  3. //$w = words near keywords to keep
  4. function truncatePreserveWords ($h,$n,$w=5,$tag='b') {
  5. 	$n = explode(" ",trim(strip_tags($n)));	//needles words
  6. 	$b = explode(" ",trim(strip_tags($h)));	//haystack words
  7. 	$c = array();						//array of words to keep/remove
  8. 	for ($j=0;$j<count($b);$j++) $c[$j]=false;
  9. 	for ($i=0;$i<count($b);$i++) 
  10. 		for ($k=0;$k<count($n);$k++) 
  11. 			if (stristr($b[$i],$n[$k])) {
  12. 				$b[$i]=preg_replace("/".$n[$k]."/i","<$tag>\\0</$tag>",$b[$i]);
  13. 				for ( $j= max( $i-$w , 0 ) ;$j<min( $i+$w, count($b)); $j++) $c[$j]=true; 
  14. 			}	
  15. 	$o = "";	// reassembly words to keep
  16. 	for ($j=0;$j<count($b);$j++) if ($c[$j]) $o.=" ".$b[$j]; else $o.=".";
  17. 	return preg_replace("/\.{3,}/i","...",$o);
  18. }

URL: http://www.barattalo.it/2009/11/24/truncate-string-preserving-some-words-in-php/

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