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<?php
/*********************************************************
 describe£º×Ö·û´®´¦Àí,¿ÉÒÔ´¦ÀíÖÐÓ¢ÎÄ
 function£ºÏòÒ»¸ö×Ö·û´®Ëæ»úÌí¼ÓÎÄ×Ö
 author£º  etongchina
 email2me: etongchina@gmail.com
 time£º    2008-06-24
 blog£º    http://etongchina.blogcn.com

*********************************************************/
function getStrlen($str){
 $_count = array();
 $count = 0;
 for($count;$count<strlen($str);){
  ord($str{$i})>127?$count+=2:$count++;
  $_count[] = $count; //ÓÃÊý×é´æ´¢¿ÉÄܲåÈëµÄλÖÃ
 }
 $_key = array_rand($_count); //´ÓÊý×éÖлñÈ¡Ëæ»ú¼ü
 return $_count[$_key];
}
$str = "ΰ´ó׿¹ú·±ÈÙ¸»Ç¿"; //Ô´×Ö·û´®
$insert_str = "-";     //´ýÌí¼ÓµÄÎÄ×Ö
$_rand = getStrlen($str);  //Ö÷º¯Êý
$_exp = "/^(.{".$_rand."})(.*)$/i"; //ÕýÔò±í´ïʽ
$t = preg_replace($_exp,"$1{$insert_str}$2",$str);
print $t;
?>


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