Customized php verification code class
Create verification code image:
Create canvas (__construct function)Set canvas background ($this->set_bgcolor();)
Get a random string ($this->get_randnum ();)
Write text to the picture (imagestring function)
Add interference points/lines ($this->set_ext_line(); $this->set_ext_pixel();)
Output picture
When instantiated without parameters, the default is a four-digit regular verification code image of 60*25 size
Method to detect verification code on form page, compare whether $_SESSION[an] is equal to $_POST[Verification code text box ID]
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