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MySQL in Myisam,innodb by default is the Btree index, as to how the data structure of btree is not important,Only need to know the result, since is the index that this data structure finally is orderly, like Xinhua dictionary His directory is

MySQL in Myisam,innodb by default is the Btree index, as to how the data structure of btree is not important,Only need to know the result, since is the index that this data structure finally is orderly, like Xinhua dictionary His directory is

PHP generates verification code class code, this verification code class supports the generation of interference points, interference lines and other interfering pixels, also can make the character tilt. In a class you can define parameters such as

Note: If you want to use PHP GD processing we need to open the GD library GD Library support for PHP under Windows Find php.ini, open content, find: ; Extension=php_gd2.dll Put the front semicolon ";" Remove, then save, if there is no semicolon,

Here there are two verification code generation programs. The first one is better, and the second one is also good. At the same time, the second generation program uses an instance to describe the call and generation of the verification code. Here

Session_start ();Class authnum {// Image object, width, height, and verification code lengthPrivate $ im;Private $ im_width;Private $ im_height;Private $ len;// Random string, Y axis coordinate value, and random colorPrivate $ randnum;Private $

Modified a very good php verification code (supporting Chinese ). Php captcha. class. php copy code :? PhpclassCaptcha {private $ width; private $ height; private $ codeNum; private $ code; private $ im; function _ const Php verification codeCaptcha.

Php Verification CodeCaptcha. class. phpCopy codeThe Code is as follows:Class Captcha{Private $ width;Private $ height;Private $ codeNum;Private $ code;Private $ im;Function _ construct ($ width = 80, $ height = 20, $ codeNum = 4){$ This-> width = $

Php Verification CodeCaptcha. class. php Copy codeThe Code is as follows: Class Captcha { Private $ width; Private $ height; Private $ codeNum; Private $ code; Private $ im; Function _ construct ($ width = 80, $ height = 20, $ codeNum = 4) { $ This->

I. Design ideas:1 topics Avoid duplication: Create two arrays, the rand () function determines the random number, adds the two numbers to two arrays, repeats the random number, determines whether the two numbers are the same as the values of two