该代码使用 php-serial 项目进行串口通讯 ，完整代码打包下载：https://github.com/gonzalo123/gam-sms 
相关的at指令集： 
at+cpin?\r : checks if sim has the pin code. it answers +cpin: ready or +cpin: sim pin if we need to insert the pin number 
at+cmgs=”[number]”\r[text]control-z : to send a sms (in php we have control-z with chr(26)). it returns ok or error 
at+cmgf=1\r: set the device to operate in sms text mode (0=pdu mode and 1=text mode). returns ok. 
at+cmgl=\”all”\r read all the sms stored in the device. we also can use “rec unread” instead of “all”. 
at+cmgd=[id]\r: deletes a sms from the device 

1.PHP代码

<?php
class Sms_Dummy implements Sms_Interface
{
    public function deviceOpen()
    {
    }
 
    public function deviceClose()
    {
    }
 
    public function sendMessage($msg)
    {
    }
 
    public function readPort()
    {
        return array("OK", array());
    }
 
    private $_validOutputs = array();
 
    public function setValidOutputs($validOutputs)
    {
        $this->_validOutputs = $validOutputs;
    }
}

2. 测试类

<?php
 
require_once('Sms.php');
require_once('Sms/Interface.php');
require_once('Sms/Dummy.php');
 
$pin = 1234;
 
$serial = new Sms_Dummy;
 
if (Sms::factory($serial)->insertPin($pin)
                ->sendSMS(555987654, "test Hi")) {
    echo "SMS sent\n";
} else {
    echo "SMS not Sent\n";
}

3. 完整类  

require_once('Sms.php');
require_once('Sms/Interface.php');
require_once('Sms/Serial.php');
 
$pin = 1234;
 
try {
    $serial = new Sms_Serial;
    $serial->deviceSet("/dev/ttyS0");
    $serial->confBaudRate(9600);
    $serial->confParity('none');
    $serial->confCharacterLength(8);
 
    $sms = Sms::factory($serial)->insertPin($pin);
 
    if ($sms->sendSMS(555987654, "test Hi")) {
        echo "SMS sent\n";
    } else {
        echo "Sent Error\n";
    }
 
    // Now read inbox
    foreach ($sms->readInbox() as $in) {
        echo"tlfn: {$in['tlfn']} date: {$in['date']} {$in['hour']}\n{$in['msg']}\n";
 
        // now delete sms
        if ($sms->deleteSms($in['id'])) {
            echo "SMS Deleted\n";
        }
    }
} catch (Exception $e) {
    switch ($e->getCode()) {
        case Sms::EXCEPTION_NO_PIN:
            echo "PIN Not set\n";
            break;
        case Sms::EXCEPTION_PIN_ERROR:
            echo "PIN Incorrect\n";
            break;
        case Sms::EXCEPTION_SERVICE_NOT_IMPLEMENTED:
            echo "Service Not implemented\n";
            break;
        default:
            echo $e->getMessage();
    }
}

4. PHP代码 

<?php
require_once('Sms.php');
require_once('Sms/Interface.php');
require_once('Sms/Http.php'); 
 
$serialEternetConverterIP = '192.168.1.10';
$serialEternetConverterPort = 1113;
$pin = 1234;
try {
     $sms = Sms::factory(new Sms_Http($serialEternetConverterIP, $serialEternetConverterPort));
     $sms->insertPin($pin);
 
    if ($sms->sendSMS(555987654, "test Hi")) {
        echo "SMS Sent\n";
    } else {
        echo "Sent Error\n";
    }
 
    // Now read inbox
    foreach ($sms->readInbox() as $in) {
        echo"tlfn: {$in['tlfn']} date: {$in['date']} {$in['hour']}\n{$in['msg']}\n";
 
        // now delete sms
        if ($sms->deleteSms($in['id'])) {
            echo "SMS Deleted\n";
        }
    }
} catch (Exception $e) {
    switch ($e->getCode()) {
        case Sms::EXCEPTION_NO_PIN:
            echo "PIN Not set\n";
            break;
        case Sms::EXCEPTION_PIN_ERROR:
            echo "PIN Incorrect\n";
            break;
        case Sms::EXCEPTION_SERVICE_NOT_IMPLEMENTED:
            echo "Service Not implemented\n";
            break;
        default:
            echo $e->getMessage();
    }
}

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