preg replace - Warning: preg_replace(): Unknown modifier 'p' in -

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when type in search form , click search keyword make / people read first (make) not second (people)

this code

for($k=$no_words; $k>0 ;$k--)         {             $w=trim($search_array[$k-1]);             if($w!='')             {                 $result[$i]['description'] = preg_replace('~'.$search_array[$k-1].'~i','<b>'.$search_array[$k-1].'</b>',$result[$i]['description']);                 $result[$i]['title'] = preg_replace('~'.$search_array[$k-1].'~','<b>'.$search_array[$k-1].'</b>',$result[$i]['title']);             }         }


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