CI Framework: How to use custom captcha libraries

Explanation:First of all, the captcha** is an img,And its src must be a dynamic generate**path,We can fix a method specifically for doing the captcha,Here take the verificationcode method as an example,This method is the method of generating**,So that there will be an initial ** when entering this page**,When we click on this**, we will keep changing the different**,That is, the use of asynchronous submission,The following is js**。

The verification code is refreshed.

function verificationcode(){

var rad = , 8));

uuuy is a parameter name that is written casually, and the backend will not do it, and the function is to avoid the browser from reading the cached link.

#randcodeimage").attr("src", verificationcode/?uuuy="+rad);

Why add a random number at the back to see because if you don't add a random number, every time you keep accessing the same exact same method, you won't actually execute this method, because it is a cache, so sometimes click on the verification code**refresh** but don't move, that's the reason, plus verification will let the system know that your access address has changed, and you won't take the cache.

Write a function, put it in the helpers folder, and load it when you use it.

It's okay to write a hepler, write a library, read more manuals.

Restart Apache. Make a test page var dump(gd info()) to output data indicating that the php gd library reference was successful.

The PHP GD library generates captchas.

PHP GD library commit page check

My Projects**:

set('sekey',c('verify_key'));

verify->_set('usezh',true);

verify->_set('bg',array(235, 246, 230));

verify->_set('length',2);

verify->_set('fontsize',14);

verify->_set('imageh',40);

verify->_set('imagew',70);

verify->_set('code',get_word())return $verify->entry(1);

The get word method is to get a two-word word at random.

Also, the font comes with TP.

The directory is at: thinkphp library think verify

"You can only use the method inside after jumping," First of all, the landlord's statement is wrong. Secondly, does the landlord want to query the database in the view? This is not recommended, and it is better to use only the helper for the view, which is any part of the helper where CI can be called.

Or what the landlord may need is:

Not to say ajax!! This is the header page, which is contained in other pages...