How to increase the character limit for post name of 200?

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1. It happens because when you save a post, WordPress calls sanitize_title function to sanitize your title. This function applies sanitize_title filter.

   One of core hooks for sanitize_title filter is sanitize_title_with_dashes function, which checks title on utf8 format by calling seems_utf8 function and if the title has utf8 format, the function call utf8_uri_encode function.

   utf8_uri_encode function receives two arguments: $utf8_string and $length. The first one is your title and the second argument is the length, which the title shouldn’t overflow.

   sanitize_title_with_dashes function passes your title with limit of 200 characters long. So if you want to change the limit you have to change standard hook for sanitize_title filter. Here we come to a bit dirty solution, but however it should help you:

   // first of all lets remove standard hook
   remove_filter( 'sanitize_title', 'sanitize_title_with_dashes' );
   
   // add our custom hook 
   add_filter( 'sanitize_title', 'wpse8170_sanitize_title_with_dashes', 10, 3 );
   function wpse8170_sanitize_title_with_dashes( $title, $raw_title = '', $context = 'display' ) {
       $title = strip_tags($title);
       // Preserve escaped octets.
       $title = preg_replace('|%([a-fA-F0-9][a-fA-F0-9])|', '---$1---', $title);
       // Remove percent signs that are not part of an octet.
       $title = str_replace('%', '', $title);
       // Restore octets.
       $title = preg_replace('|---([a-fA-F0-9][a-fA-F0-9])---|', '%$1', $title);
   
       if (seems_utf8($title)) {
           if (function_exists('mb_strtolower')) {
               $title = mb_strtolower($title, 'UTF-8');
           }
           $title = utf8_uri_encode($title, 1000); // <--- here is the trick!
       }
   
       $title = strtolower($title);
       $title = preg_replace('/&.+?;/', '', $title); // kill entities
       $title = str_replace('.', '-', $title);
   
       if ( 'save' == $context ) {
           // Convert nbsp, ndash and mdash to hyphens
           $title = str_replace( array( '%c2%a0', '%e2%80%93', '%e2%80%94' ), '-', $title );
   
               // Strip these characters entirely
               $title = str_replace( array(
               // iexcl and iquest
               '%c2%a1', '%c2%bf',
               // angle quotes
               '%c2%ab', '%c2%bb', '%e2%80%b9', '%e2%80%ba',
               // curly quotes
               '%e2%80%98', '%e2%80%99', '%e2%80%9c', '%e2%80%9d',
               '%e2%80%9a', '%e2%80%9b', '%e2%80%9e', '%e2%80%9f',
               // copy, reg, deg, hellip and trade
               '%c2%a9', '%c2%ae', '%c2%b0', '%e2%80%a6', '%e2%84%a2',
               // grave accent, acute accent, macron, caron
               '%cc%80', '%cc%81', '%cc%84', '%cc%8c',
           ), '', $title );
   
           // Convert times to x
           $title = str_replace( '%c3%97', 'x', $title );
       }
   
       $title = preg_replace('/[^%a-z0-9 _-]/', '', $title);
       $title = preg_replace('/s+/', '-', $title);
       $title = preg_replace('|-+|', '-', $title);
       $title = trim($title, '-');
   
       return $title;
   }
   

   As you can see we use completely the same sanitize_title_with_dashes function with one change: instead of passing 200, we pass 1000 as the limit for title.

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