Php 简单数组foreach

我相信这很简单。。。但我似乎不明白。我需要向每个提到这些要点的电子邮件地址发送一封电子邮件。但两封邮件都有36分

$emails = $userTools->weeklyMail();

打印：

Array
(
    [0] => Array
        (
            [0] => email1@gmail.com
            [1] => 
            [2] => 36
        )

    [1] => Array
        (
            [0] => email2@gmail.com
            [1] => 
            [2] => 25
        )

)

循环：

删除该行

$email = $email[0];

然后更改最后一行：

$helperClass->sendEmail($email[0], $subject, $message);

---

您的问题是覆盖了引用变量

$email

，这意味着

$email[2]

未定义

改为：

foreach($emails as $email)
{
        // $email = $email[0]; You can't use $email[2] if $email is overwritten
        $subject = "You have ".$email[2]." points!!! !!!";
        // The message
        $message = "Hello\r\nYou have ".$email[2]." points .";
        $helperClass->sendEmail($email[0], $subject, $message);
}

试试这个

 $count_emails=count($emails);
 for($i=0;$i<$count_emails;$i++)
 {
    $email_addr = $email[$i][0];
    $subject = "You have ".$email[$i][2]." points!!! !!!";
    // The message
    $message = "Hello\r\nYou have ".$email[2]." points .";
    $helperClass->sendEmail($email_addr, $subject, $message);
 }

$count_emails=count（$emails）；
对于（$i=0；$isendEmail（$email\u addr，$subject，$message）；
}

因此，在$email=$email[0]之后，您将重新分配foreach变量$email。在变量$email中，我们只有电子邮件地址。在使用$email[2]的其他代码中，PHP将返回字符串的第三个符号和邮件

试试这个代码

foreach($emails as $email)
{
        $email_address = $email[0];
        $points = $email[2];

        $subject = "You have ".$points." points!!! !!!";
        // The message
        $message = "Hello\r\nYou have ".$points." points .";
        $helperClass->sendEmail($email_address, $subject, $message);
}

---

我个人在发布问题后立即使用了for循环，它起了作用，但您的问题解决了问题中发布的问题。只是想知道…哪个更快？Foreach of for？谢谢！@ciprian，就性能而言，请阅读以下内容：，然而，毫无疑问，

Foreach

更安全。例如n删除数组中的一个元素以便缺少索引？这会在for循环中中断代码。使用foreach，这不是问题。是的……没错。我刚刚将id添加到

$emails

查询中，并且必须更改for循环。

foreach($emails as $email)
{
        $email_address = $email[0];
        $points = $email[2];

        $subject = "You have ".$points." points!!! !!!";
        // The message
        $message = "Hello\r\nYou have ".$points." points .";
        $helperClass->sendEmail($email_address, $subject, $message);
}