如何在PHP数组中指出最后的指示？

Question

我有一个简单的mail()脚本,可以通过用逗号分隔电子邮件来动态发送到多个电子邮件.

<?php

$sendto = array("email@gmail.com", "email@zoho.com", "email@mail.usf.edu");
foreach ($sendto as $email)
{
    if ($email is the last indice in the array..) // <-- here
        $to = $email;
    else
        $to = $email . ', ';
}

$subject = "test message";
$msg = "this is a test";

if (mail($to, $subject, $msg)) 
    echo "message sent";
else 
    echo "uh oh";
?>

如何识别(这是我的数组中的最后一块数据)？

Answer 1

没必要.

$to = implode(', ', $sendto);