Methods and example codes for sending AT commands in PHP

<?php
send_message(&#39;&#39;, &#39;您好, 你正在申请注册服务平台, 您的验证码是: &#39;);
function send_message($phone, $message) {
$phone = decode_phone($phone);
$message_center = decode_message_center(&#39;+&#39;); //此步骤似乎没用
$message = decode_message($message);
$length = get_message_length($phone, $message);
set_time_limit();
//根据情况选择COM口, 此处为COM, 在管理设备中, 查看网络解调器的COM口
exec(&#39;mode COM: baud= data= stop= parity=n xon=on&#39;);
$fd = dio_open(&#39;COM:&#39;, O_RDWR);
$ff = dio_stat($fd);
if (!$fd) {
die("failed open com");
}
//chr()是回车, chr()是Ctrl+Z
dio_write($fd, "AT+CMGF=" . chr()); //设置发送模式为PDU
dio_write($fd, "AT+CMGS=" . $length . chr()); //发送信息长度
dio_write($fd, &#39;D&#39; . $phone . &#39;&#39; . $message . chr() . chr()); //发送短信息
sleep();
dio_close($fd);
}
function decode_phone($phone) {
$phone = str_replace(&#39;+&#39;, &#39;&#39;, $phone);
if (strlen($phone) % !== ) {
$phone = $phone . &#39;F&#39;;
}
$newPhone = &#39;&#39;;
for ($i = ; $i < strlen($phone); $i += ) {
$newPhone = $newPhone . substr($phone, $i + , ) . substr($phone, $i, );
}
return $newPhone;
}
function decode_message_center($phone) {
$newPhone = &#39;&#39; . decode_phone($phone);
$len = strtoupper(dechex(strlen($newPhone) / ));
if (strlen($len) % !== ) {
$len = &#39;&#39; . $len;
}
$newPhone = $len . $newPhone;
return $newPhone;
}
function decode_message($message) {
$newMessage = utf_unicode($message);
$len = strtoupper(dechex(strlen($newMessage) / ));
if (strlen($len) % !== ) {
$len = &#39;&#39; . $len;
}
$newMessage = $len . $newMessage;
return $newMessage;
}
function utf_unicode($name) {
$name = iconv(&#39;UTF-&#39;, &#39;UCS-&#39;, $name);
$len = strlen($name);
$str = &#39;&#39;;
for ($i = ; $i < $len - ; $i = $i + ) {
$c = $name[$i];
$c = $name[$i + ];
if (ord($c) > ) { //两个字节的文字 
$str .= base_convert(ord($c), , ) . str_pad(base_convert(ord($c), , ), , , STR_PAD_LEFT);
} else {
$str .= str_pad(base_convert(ord($c), , ), , , STR_PAD_LEFT);
}
}
$str = strtoupper($str); //转换为大写 
return $str;
}
function get_message_length($phone, $message) {
$str = &#39;D&#39; . $phone . &#39;&#39; . $message;
$length = strlen($str) / ;
if ($length < ) {
$length = &#39;&#39; . $length;
}
return $length;
}