2834     }

  2835   }

  2836   return $haystack;

  2837 }

  2838 

  2839 /**

  2840  * Replaces all given occurences of needle in haystack, case insensitively.

  2841  * @param string Needle

  2842  * @param string Thread

  2843  * @param string Haystack

  2844  * @return string

  2845  */

  2846 

  2847 function str_replace_i($needle, $thread, $haystack)

  2848 {

  2849   $needle_len = strlen($needle);

  2850   $haystack_len = strlen($haystack);

  2851   for ( $i = 0; $i < $haystack_len; $i++ )

  2852   {

  2853     $test = substr($haystack, $i, $needle_len);

  2854     if ( strtolower($test) == strtolower($needle) )

  2855     {

  2856       // Got it!

  2857       $upto = substr($haystack, 0, $i);

  2858       $from = substr($haystack, ( $i + $needle_len ));

  2859       $haystack = "{$upto}{$thread}{$from}";

  2860       $haystack_len = strlen($haystack);

  2861       $i = $i + strlen($thread);

  2862     }

  2863   }

  2864   return $haystack;

  2865 }

  2866 

  2867 /**

  2868  * Highlights a term in a string.

  2869  * @param string Needle (term to highlight)

  2870  * @param string Haystack (search string)

  2871  * @param string Starting tag (<b>)

  2872  * @param string Ending tag (</b>)

  2873  * @return string

  2874  */

  2875 

  2876 function highlight_term($needle, $haystack, $start_tag = '<b>', $end_tag = '</b>')

  2877 {

  2878   $needle_len = strlen($needle);

  2879   $haystack_len = strlen($haystack);

  2880   for ( $i = 0; $i < $haystack_len; $i++ )

  2881   {

  2882     $test = substr($haystack, $i, $needle_len);

  2883     if ( strtolower($test) == strtolower($needle) )

  2884     {

  2885       // Got it!

  2886       $upto = substr($haystack, 0, $i);

  2887       $from = substr($haystack, ( $i + $needle_len ));

  2888       $haystack = "{$upto}{$start_tag}{$test}{$end_tag}{$from}";

  2889       $haystack_len = strlen($haystack);

  2890       $i = $i + strlen($needle) + strlen($start_tag) + strlen($end_tag);