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Finding mulitple occurences of a string withing another

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I wrote this method just to find multiple occurences of a substring withing another and return indexed-positions that matched in an array.

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  1. function multipleSubstringOccurences($string,$substring)
  2. {
  3. 		$string=strtolower($string);
  4.                 $substring=strtolower($substring);
  5. 		$matched_positions=array();
  6. 		$sample_string_to_be_matched=$string;
  7. 		$string_to_be_found=$substring;
  8. 		$strlen_string_to_be_found=strlen($string_to_be_found);
  9. 		$matched_positions[]=strpos($sample_string_to_be_matched,$string_to_be_found);
  10.  
  11. 		if(strpos($sample_string_to_be_matched,$string_to_be_found))
  12. 		{
  13. 			$current_array_index=0;
  14. 			$cur_pos=strpos($sample_string_to_be_matched,$string_to_be_found)+$strlen_string_to_be_found;
  15. 			$still_finding=true;
  16. 			while($still_finding)
  17. 			{
  18. 				$sample_string_to_be_matched=substr($sample_string_to_be_matched,$cur_pos,strlen($sample_string_to_be_matched));
  19. 				if(strpos($sample_string_to_be_matched,$string_to_be_found))
  20. 				{
  21. 					$still_finding=true;
  22. 					$cur_pos=strpos($sample_string_to_be_matched,$string_to_be_found)+$strlen_string_to_be_found;
  23. 					$matched_positions[]=$matched_positions[$current_array_index]+strpos($sample_string_to_be_matched,$string_to_be_found)+$strlen_string_to_be_found;
  24. 					$current_array_index++;
  25. 				}
  26. 				else
  27. 				{
  28. 					$still_finding=false;
  29. 				}
  30.  
  31.  
  32. 			}
  33. 		}
  34. 		else
  35. 		{
  36. 			return false;
  37. 		}
  38.  
  39. 		return $matched_positions;
  40.  
  41. }
  42.  
  43. //Usage
  44.  
  45. $string_main="Life is sometimes hard. Sometimes it's delightful.";
  46. $string_to_find="Sometimes";
  47. $res_array=array();
  48. $res_array=multipleSubstringOccurences($string_main,$string_to_find);
  49.  
  50. /*
  51.  
  52. Will return an array with all starting indexes of string "sometimes".
  53.  
  54. */

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