Call SMS interface source code v1.2

I remember that I released the source code of the PHP calling interface to everyone in 2012. This is from asp.net, but the principle is basically the same. In order to prevent some software from maliciously obtaining the mobile phone verification code, this example adds a picture verification code, and That is to say, you must first enter the verification code in the picture before you can obtain the mobile phone verification code. This can effectively prevent malicious software from obtaining mobile phone text messages. Of course, if the software that maliciously obtains mobile phone text messages can recognize your verification code, then there is no point in doing so. But there are actually many ways to prevent malicious acquisition. This is just one example. I hope it can help everyone. If you call the interface, you still call 56 SMS Network. Regarding the values ​​returned in the interface, you can also refer to 56 SMS Network for details.