php - Fatal error: Cannot re-assign auto-global variable _POST -

i can't access wp (version3.4.2) admin. says mentioned above

fatal error: cannot re-assign auto-global variable _post in /home/xxx/public_html/wp-content/themes/rtthemes16/rt-framework/classes/admin.php on line 540.

the line 540 :

function rt_check_sidebar_array($_post){      if(is_array($_post)){          $start_unset_count = 0;          foreach($_post $key => $value){             if(stristr($key, '_sidebar_name') == true && $value=="") {                                   unset($_post[$key]);                 $start_unset_count = 1;             }              if($start_unset_count>0){                 unset($_post[$key]);                 $start_unset_count++;             }              if($start_unset_count==6){                 $start_unset_count = 0;             }                        }     }       $newpost == $newpost ? $newpost : $_post;            return $_post; } 

any insights? :)

since php 5.4, cannot use superglobal parameter function

$_post globally accessible. don't have pass function.

http://php.net/manual/en/language.variables.superglobals.php#112184

this how function should like

function rt_check_sidebar_array(){      if(is_array($_post)){          $start_unset_count = 0;          foreach($_post $key => $value){             if(stristr($key, '_sidebar_name') == true && $value=="") {                                   unset($_post[$key]);                 $start_unset_count = 1;             }              if($start_unset_count>0){                 unset($_post[$key]);                 $start_unset_count++;             }              if($start_unset_count==6){                 $start_unset_count = 0;             }                        }     }       $newpost == $newpost ? $newpost : $_post;            return $_post; }