使用isset（$ _ POST ['name']）進行PHP表單驗證

Question

Robin Nixon的書中的代碼：

if (isset($_POST['user'])) {
  $user = sanitizeString($_POST['user']);
  $pass = sanitizeString($_POST['pass']);
  if ($user == "" || $pass == "")
    $error = "Not all fields were entered<br><br>";
  else {
    $result = queryMysql("SELECT * FROM members WHERE user='$user'");
    if ($result - > num_rows)
      $error = "That username already exists<br><br>";
    else {
      queryMysql("INSERT INTO members VALUES('$user', '$pass')");
      die("<h4>Account created</h4>Please Log in.<br><br>");
    }
  }
}

為什么他在這里使用isset（$ _ POST ['user']）？ 為什么他不使用isset（$ _ POST ['submit']代替？

Answer 1

准則已缺少結束括號。

<?php
if (isset($_POST['user']))
{
$user = sanitizeString($_POST['user']);
$pass = sanitizeString($_POST['pass']);
if ($user == "" || $pass == "")
$error = "Not all fields were entered<br><br>";
else
{
$result = queryMysql("SELECT * FROM members WHERE user='$user'");
if ($result->num_rows)
$error = "That username already exists<br><br>";
else
{
queryMysql("INSERT INTO members VALUES('$user', '$pass')");
die("<h4>Account created</h4>Please Log in.<br><br>");
 } 
}
}
?>

現在，如果設置了POST用戶，該代碼將接受。 或者如果在您的html表單字段上實現代碼，則提交！ 如果您需要POST提交檢查，那么..我想做什么？ 請告知我可以根據需要進行修改。