gistfile1.txt

function ozet($max_char, $more_link_text = '(devamı»)', $stripteaser = 0, $more_file = '') {
    $content = get_the_content($more_link_text, $stripteaser, $more_file);
    $content = apply_filters('the_content', $content);
    $content = str_replace(']]>', ']]>', $content);
    $content = strip_tags($content);

   if (strlen($_GET['p']) > 0) {
      echo "";
      echo $content;      
      echo " ";
   }
   else if ((strlen($content)>$max_char) && ($espacio = strpos($content, " ", $max_char ))) {
        $content = substr($content, 0, $espacio);
        $content = $content;
        echo "";
        echo $content;
        echo " ";        
   }
   else {
      echo "";
      echo $content;      
      echo " ";
   }
}

gistfile2.txt

<?php ozet(500)?> ...