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public  function  insertData( $table , $data ){
        $field =implode( ',' ,  array_keys ( $data ));
        foreach  ( array_values ( $data )  as  $key => $val ){
         $value  .= "'" . $val . "'" ;
         if  ( $key < count ( $data )-1)
         $value  .= "," ;
         }
      $sql =  "INSERT INTO " . $table . "(" . $field . ") values(" . $value . ")" ;
         return  $this ->insert( $sql );
        }