PHP截取发动短信内容的方法

$str_tmp  = DAdmin_Utils::gbkStrSplit(“短信内容”, 700);//内容过长返回的是一个截取内容后的数组  700指的是截取的长度    $total = count($str_tmp);    $num  = 1;    foreach($str_tmp as $str)    {      if($total > 1)      {       $str = $str . "{$num}/{$total}";       $num ++;      }      $sign = strtoupper(md5($key.$pMobile.$str.$ip));      $url = "短信地址?from=37&sgin=".$sign."&tel=".$pMobile."&msg=".$str;      $ret = file_get_contents($url);      $result = json_decode($ret,true);    }//发送短信方法function gbkStrSplit($string, $len = 1)  {    $length = strlen($string);//获取长度，汉字占三个字节    $retstr = '';    $retArr = array();    for ($i = 0; $i < $length; $i++) {      $retstr .= ord($string[$i]) > 127 ? $string[$i] . $string[++$i] : $string[$i];      $len_tmp = strlen($retstr);      if ($len_tmp >= $len) {        $retArr[] = $retstr;        $retstr = '';      }    }    if ($retstr != '') {      $retArr[] = $retstr;    }    return $retArr;  }