数组和foreach

Question

知道为什么不打印这些错误吗？

// Validate the email
if (preg_match($regex, $email))  
        $errors[] = "Invalid email address";

    // ... and the password
    if (strlen($password) < 4)
        $errors[] = "Password is too short";

    // No errors?   
    if (empty($errors))
    {
        // insert into db

    }

// If there were any errors, show them
if (!empty($errors))
{
    $errors = array();
    foreach ($errors as $error)
    echo '<li>'.$error.'</li>';
}

Answer 1

你在输出之前覆盖了数组.

 $errors = array();  // Creates an empty array
 foreach ($errors as $error)  // Won't do anything

删除$errors = array()它应该工作.

$errors = array()在脚本的最开始初始化的方式会更清晰,然后检查count($errors) > 0而不是empty:

// No errors?   
if (count($errors) == 0)
{
 // insert into db

}

// If there were any errors, show them
else
{
    $errors = array();
    foreach ($errors as $error)
    echo '<li>'.$error.'</li>';
}

这样,您将避免关于$error未设置的通知.