php 解析错误，带有意外的“;” 在第 12 行，但没有任何问题

Question

第 12 行存在问题（显示该行的注释）。显然，有一个意想不到的';' （分号）在那一行。虽然唯一的分号是关闭在移动到下一行之前总是需要的特定行。 <?php// creating a master if to see if the submit button was pressed.if (isset($_POST['signup-submit'])) {// connecting to the database validation file in the same file.  require 'dbh.inc.php';  $username = $POST['username'];  $email = $POST['email'];  $password = $POST['password'];  $repeatPassword = $POST['repeat_password'];  //error handlers time!!  if (!filter_var($email,FILTER_VALIDATE_EMAIL && !preg_match("/^[a-zA-Z0-9]*$/",$username)) {    header("Location: ../signup.php?error=invalidemailusername");  //this is line 12 with the issue    exit();  }  else if (!preg_match("/^[a-zA-Z0-9]*$/",$username)) {    header("Location: ../signup.php?error=invalidusername&email=".$email);    exit();  }解析错误：语法错误，意外的“;” 在（没有隐私文件位置）在第 12 行

Answer 1

这个：

if (!filter_var($email,FILTER_VALIDATE_EMAIL && !preg_match("/^[a-zA-Z0-9]*$/",$username)) {

应该是这样的：

if (!filter_var($email,FILTER_VALIDATE_EMAIL) && !preg_match("/^[a-zA-Z0-9]*$/",$username)) {

Answer 2

它解决了

请检查此代码

(!filter_var($email,FILTER_VALIDATE_EMAIL && !preg_match("/^[a-zA-Z0-9]*$/",$username)) here add one bracket

 if (!filter_var($email,FILTER_VALIDATE_EMAIL && !preg_match("/^[a-zA-Z0-9]*$/",$username))) {

    header("Location: ../signup.php?error=invalidemailusername");  //this is line 12 with the issue

    exit();

  }