php - Find prefix cms in mysql DB -

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i want prefix db of cms.
make code, not work when if in db more cms(joomla, opencart, wordpress) or make backup. can access prefix more gracefully?

        $this->connectdb();         $result = mysql_query("show tables;");         while($row = mysql_fetch_row($result)){           $allrows[] = $row[0];         }         $index = preg_grep("/^.+_user$/", $allrows);         $pieces = explode("_", array_pop($index));         $this->_prefix=$pieces[0]."_"

;

try follow

$this->connectdb();         $result = mysql_query("show tables;");         while($row = mysql_fetch_row($result)){           $allrows[] = $row;         }         $index = preg_grep("/^.+_user$/", $allrows);         $pieces = explode("_", array_pop($index));         $this->_prefix=$pieces[0]."_"

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