PHP를 사용하여 이메일 전송 통계 보고서를 구현하는 방법은 무엇입니까?

class EmailReport {
    private $sender; // 发件人
    private $receiver; // 收件人
    private $subject; // 邮件主题
    private $sendTime; // 发送时间

    public function __construct($sender, $receiver, $subject, $sendTime) {
        $this->sender = $sender;
        $this->receiver = $receiver;
        $this->subject = $subject;
        $this->sendTime = $sendTime;
    }

    public function getSender() {
        return $this->sender;
    }

    public function getReceiver() {
        return $this->receiver;
    }

    public function getSubject() {
        return $this->subject;
    }

    public function getSendTime() {
        return $this->sendTime;
    }
}

function generateEmailStatReport($emailReports) {
    $report = array();
    $totalEmails = count($emailReports);

    // 统计每个发件人的发送次数
    foreach ($emailReports as $report) {
        $sender = $report->getSender();
        if (isset($report[$sender])) {
            $report[$sender]++;
        } else {
            $report[$sender] = 1;
        }
    }

    // 输出统计结果
    echo "发件人        发送次数
";
    foreach ($report as $sender => $count) {
        echo "$sender        $count
";
    }

    // 输出总计
    echo "总计：$totalEmails 封邮件
";
}

$emailReports = array(
    new EmailReport("sender1@example.com", "receiver1@example.com", "邮件主题1", "2021-01-01 09:00:00"),
    new EmailReport("sender2@example.com", "receiver2@example.com", "邮件主题2", "2021-01-02 10:00:00"),
    new EmailReport("sender1@example.com", "receiver3@example.com", "邮件主题3", "2021-01-02 11:00:00"),
    new EmailReport("sender3@example.com", "receiver4@example.com", "邮件主题4", "2021-01-03 12:00:00"),
    new EmailReport("sender1@example.com", "receiver5@example.com", "邮件主题5", "2021-01-03 13:00:00"),
);

generateEmailStatReport($emailReports);

发件人              发送次数
sender1@example.com 3
sender2@example.com 1
sender3@example.com 1
总计：5 封邮件