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PHP : highlight keywords in a text

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  1. /*
  2. neo_highlight_keywords(string $text, array $keywords, string $tag_start, string $tag_end)  
  3. use : echo neo_highlight_keywords($text, $keywords, '<span>', '</span>');
  4. $keywords between $tag_start and $tag_end
  5. better match with function neo_remove_accent()
  6. */
  7. function neo_highlight_keywords($text, $keywords, $tag_start, $tag_end){
  8. 	$original 	= $text;
  9. 	$text 		= strtolower($text); // can use with function neo_remove_accent($text)
  10. 	$tagLen 	= (strlen($tag_start) + strlen($tag_end));
  11.  
  12. 	foreach($keywords as $keyword){		
  13. 		$keyword	= strtolower($keyword); // can use with function neo_remove_accent($text)
  14. 		$current	= $offset = $delta = 0; 
  15. 		$len 		= strlen($keyword);
  16.  
  17. 		while(( FALSE !== ($pos = strpos($text, $keyword, $offset)))){
  18. 			$original	= substr($original, 0, ($pos + $delta))
  19. 						.$tag_start.substr($original, ($pos + $delta), $len).$tag_end
  20. 						.substr($original, ($pos + $delta + $len));
  21.  
  22. 			$delta		+= $tagLen; // Add String Tags Lenght
  23. 			$offset		= $pos + 1;
  24. 			}
  25. 		} 
  26. 	return $original;
  27. }

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