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Highlight within HTML/BBCode without source breaking

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  1. /**
  2.  * (contexto[, busqueda[, reemplazo[, ordinal]]])
  3.  *
  4.  * Resalta palabras dentro de una cadena de texto.
  5.  */
  6. function search($text, $find, $repl = '<strong>\\1</strong>', $ord = 32)
  7. {
  8. 	global $tags, $num;
  9.  
  10. 	$num = 0; // contador
  11. 	$tags = array(); // pila
  12.  
  13. 	$char = is_numeric($ord)?
  14. 		chr($ord): $ord[0]; // caracter?
  15.  
  16. 	if (!function_exists('_search_backup_tags'))
  17. 	{ // guardamos el HTML
  18. 		function _search_backup_tags($test)
  19. 		{
  20. 			global $tags, $num;
  21. 			 // guardamos el tag completo
  22. 			$tags[$num] = $test[0];
  23.  
  24. 			$tag = "<!$num>";
  25. 			$num++; // pisa y corre!
  26. 			return $tag;
  27. 		}
  28. 	}
  29. 	if (!function_exists('_search_restore_tags'))
  30. 	{ // recuperamos el HTML
  31. 		function _search_restore_tags($test)
  32. 		{
  33. 			global $tags; // xD
  34. 			return $tags[$test[1]];
  35. 		}
  36. 	}
  37.  
  38. 	$text = // escapamos tags tipo HTML/BBCode
  39. 	preg_replace_callback('/([<\[][^>\]]+\/?[\]>])/', '_search_backup_tags', $text);
  40.  
  41. 	// ----------------------------- Resaltamos!
  42. 	$found = array();
  43. 	$word = // separamos en palabras?
  44. 		explode($char, $find);
  45.  
  46. 	foreach ($word as $test)
  47. 	{ // Escapamos las "wildcards"
  48. 		$found[] = preg_quote(strip_tags($test));
  49. 	}
  50.  
  51. 	$expr = join('|', $found); // unimos
  52. 	$text = // Aqui ocurre toda la magia....
  53. 		preg_replace("/($expr)/is", $repl, $text);
  54.  
  55.  
  56. 	// recuperamos etiquetas HTML/BBCode
  57. 	$text = preg_replace_callback('/<!(\d+)>/', '_search_restore_tags', $text);
  58.  
  59. 	return $text;
  60. }

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