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public function id_verify($my_id) {
 
    $coefficient = array(7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2);
 
    $remainder_map = array(1,0,'X',9,8,7,6,5,4,3,2);
 
    $count = 0;
     
    for ($i=0; $i < 17; $i++) { 
         
        $count += $my_id[$i] * $coefficient[$i];
    }
 
    $remainder = $count % 11;
 
    if ($my_id[17] == $remainder_map[$remainder]){
 
        echo 'true';
    }else{
 
        echo 'false';
    }
}