Methods and example codes for sending AT commands in PHP

This article mainly introduces the relevant information about the example code of PHP sending AT command. It is very good and has reference value. Friends who need it can take a look.

Requirement:Send SMS to The user enters his mobile phone and is required to customize the message content

Problem:There is no telecom mode, and the free api interface cannot be used to customize the text message content

Solution:Connect to the server through a 4G network card, operate the network card through AT commands, and send text messages

After checking, it was found that AT quality sending requires multiple encoding of the information, and the sending times out. , but the actual sending was successful, the problem has not been completely solved

The code is as follows:

 ) { //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 = 'D' . $phone . '' . $message; $length = strlen($str) / ; if ($length < ) { $length = '' . $length; } return $length; }

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