<?php

$conn = db_connect();

$sql = sprintf('update users set password = "%s" where id = %s',

    $_POST['password'],

    $_GET['id']

);

echo $sql . PHP_EOL;

$result = $conn->query($sql);

if(!$result){

    echo 'sql执行出错' . PHP_EOL;

}

function db_connect() {

   $result = new mysqli('', '', '', '');

   if (!$result) {

      return false;

   }

   $result->autocommit(TRUE);

   return $result;

}

function db_result_to_array($result) {

   $res_array = array();

   for ($count=0; $row = $result->fetch_assoc(); $count++) {

     $res_array[$count] = $row;

   }

   return $res_array;

}