Codeigniter entry (2) verification code

A simple verification code is basically used during logon. First, use the captcha method provided by CI, which is located in the system/helpers/captcha_helper.php controller.

A simple verification code is basically used during logon. use the captcha method provided by CI, which is located in system/helpers/captcha_helper.php.

Controller

First, load the captcha_helper.php auxiliary method in the controller. the code is as follows:

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_ Captcha (); $ this-> load-> view ('Welcome _ message', $ out_datas);} privatefunction_captcha () {$ this-> load-> helper ("my_captcha"); // load the verification code $ vals = array ('IMG _ path' => '. /captcha/', // address for storing the verification code Image 'IMG _ url' => base_url (). "/captcha/", // path for image access 'IMG _ width' => '60', // The Image width is 'IMG _ height' => 20, // height 'expiration' => 1, // storage time, 1 minute 'word _ length' => 4 // display several verification numbers ); $ cap = create_captcha ($ vals); $ out_datas ["v_img"] = $ cap ["image"]; // generated image file $ out_datas ["v_word"] = $ cap ["word"]; // The generated verification code can also be stored in the session to manage return $ out_datas ;}} # In 'IMG _ path' => '. /captcha/'. we store the generated images in the project/captcha Directory. Therefore, we need to create the captcha directory in the same-level Directory of the application, used to store the verification code Image applicationcaptcha -- create a file system in the same directory of the application

View

Then display the image in application/views/welcome_message.php

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Welcome to CodeIgniter! Verification code: Page renderedin 0.4593Seconds. '. CI_VERSION .'':'?>

The form_open method is used here, so you need to load the form_helper.php file. However, this method is often used later, so it is added to application/config/autoload. load the php file, so that CI will automatically help us load.

1	$ Autoload ['helper '] = array ('URL', 'form ');

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# Since the image width we set is 60 PX and only four characters are displayed at the same time, and the default value in CI is PX and the length is 8, the verification code will jump out of the image during refresh, the modification method is as follows.

1. change the font color to a simhei, so that the font color is clear.

2. the verification code is displayed in the image (do not jump out of the image)

First

Create the MY_captcha_helper.php file in application/helper/. the content is consistent with that in system/helper/captcha_helper.php. then modify the code.

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-- In row 88th // $ text_color = imagecolorallocate ($ im, 204,153,153); $ text_color = imagecolorallocate ($ im, 0 ); // The font is black -- in row 128 // $ x = rand (0, $ img_width/($ length/3); $ x = rand (0, $ img_width/($ length); // X coordinate -- in row 143 // $ y = rand (0, $ img_height/2); $ y = rand (0, $ img_height/3); // Y coordinate

Download my_captcha_helper.php

Then

Modify the loading code in the controller

1	$ This-> load-> helper ("my_captcha"); // load the verification code

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