PHP Mail Function waits and not working with foreach loop

问题

I am trying to send mail to all users that have no created reports in one month, also trying to send mail to this users with foreach loop and with mail function, when i refresh one by one then it sends mail one by one, then it works. i want to send mail to all this users in one time.

        $from = "xxx@xxx.com";
        $subject = "";
        $headers = "";
        $inc = 0;
        foreach($query->result_array() as $row)
        {
            $inc++;
            $to = $row['us_email'];
            $to_date = $row['report_date'];
            if($to_date != "0000-00-00")
            {
                $subject = "Hello! (Reports Are Not Created).";

                //begin of HTML message 
                $message = "1 month above you should create reports.";
            }
            else if($to_date == "0000-00-00")
            {
                $subject = "Hello! (Generate Reports).";

                //begin of HTML message 
                $message ="generate reports to get more.";
            }
            $headers  = "MIME-Version: 1.0" . "\r\n";
            $headers .= "Content-type: text/html; charset=iso-8859-1" . "\r\n";
            $headers .= "To: User <".$to.">, Admin <".$from.">" . "\r\n";
            $headers .= "From: Complete Online Marketing <".$from.">" . "\r\n";
            $headers .= "Reply-To: Recipient Name <".$from.">";
            $headers .= "Cc: [email]".$from."[/email]" . "\r\n";
            $headers .= "Bcc: [email]".$from."[/email]" . "\r\n";


            // now lets send the email.
            if(mail($to, $subject, $message, $headers))
            {
                echo $inc.") ".$row['us_firstname']." ".$row['us_lastname']." - Sending Success...\n";
                $ins = array('report_mail'=>'0');
                $this->db->update('se_user', $ins, array('us_id' => $row['us_id']));
            }
            else
            {
                echo $inc.") ".$row['us_firstname']." ".$row['us_lastname']." - Sending Fail...\n";
            }
        }

来源：https://stackoverflow.com/questions/25870594/php-mail-function-waits-and-not-working-with-foreach-loop