PHP digital verification code, php digital verification code _ PHP Tutorial

PHP digital verification code and php digital verification code. PHP digital verification code, php digital verification code is very convenient to implement the verification code in php, the key point is to master the phpgd library and session usage. The example of php verification code generation on the Internet: PHP digital verification code and php digital verification code

It is very convenient to implement the verification code in php. The key point is to master the usage of the php gd library and session.

Looking at the Online php verification code generation example, there is no combination of php gd library and session, and php is used to generate a random number.

PHP verification codes can be divided into many types, including php image verification codes, php random verification codes, and php Chinese verification codes. different verification codes are used for different application scenarios.

Here is a php digital verification code for your reference.

1. digital verification code

/** Filename: authpage. php */session_start (); // srand (double) microtime () * 1000000); $ authnum = $ _ SESSION ['authnum']; // verify whether the user input is consistent with the verification code if (isset ($ _ POST ['authinput']) {if (strcmp ($ _ POST ['authinput'], $ _ SESSION ['authnum']) = 0) echo "verification successful! "; Else echo" verification failed! ";}/// Generate a new four-digit integer verification code // while ($ authnum = rand () % 10000) <1000);?>

Authimg. php

　　

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