Thinkphp Verification Code using a concise tutorial _php tutorial

first, the controller must be added to the verification code method admin/lib/action/loginaction.class.php
Knowledge Points:
1. Ob_clean function Use
2. Import method call think default class library
3. Image class Buildimageverify method use

The code is as follows:
Copy the Code code as follows:
Public Function Verify () {
Ob_clean ();
Ob_clean function empties the previous output
Import (' ORG. Util.image ');
Import calls the Image.class.php class file in the expansion pack extend/library/org/util/in the message/thinkphp framework directory
Image::buildimageverify ();
Call the Buildimageverify method to generate the verification code, the default parameter is ($length =4, $mode =1, $type = ' png ', $width =48, $height =22, $verifyName = ' Verify '), interested friends can study the following image class
}

Second, add the Verification code module in the template file admin/tpl/login/index.html
Knowledge Points:
1. Verification Code Image Call
2, JS related operating procedures to understand
3. __public__ Constants

Add the following code after the Password entry box:
Copy the Code code as follows:





__public__ constants can be found in the page after loading, "View page source files" in the definition of the __public__ directory, the default is the project root message under the public directory, the following explains how to customize __public__ system constants
jquery file, the only way to invoke jquery is to load this file.

Here the specific code will be posted below, in fact, just define a change_code function, that is, replace the verification Code asynchronous operation (can be changed without refreshing the page)

Message Board BackGround

Login.js files in the message/public/directory
The contents of the file are as follows:
Copy the Code code as follows:
Verifyurl = ' http://localhost/message/admin.php/Login/verify ';
Defining the CAPTCHA Path
function Change_code (obj) {
$ ("#code"). attr ("src", verifyurl+ '/' +math.random ());
Dynamic generation of CAPTCHA methods, interested friends can delve into the next JQ method
return false;
}

Another: __public__ file is defined in message/admin/conf/config.php
In the configuration, you can change the __public__ path by adding the following:
The configuration is as follows:
Copy the Code code as follows:
Constant-dependent configuration
' Tmpl_parse_string ' = Array (
' __public__ ' = __root__. '/' . App_name. '/public ',
The path changes to Message/admin/public, refresh the page, the verification code can still be refreshed, then the JS is in effect, you can also "view the page source file"
),

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