PHP method tutorial for generating random strings and CAPTCHA classes

This article mainly explains the "generation of random strings and CAPTCHA class PHP method tutorial", the content of the article is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "generate random string and CAPTCHA class PHP method tutorial"!

The implementation of the following code, mainly to make a good distinction between one get_code () and another create_check_image (), the output image directly calls the latter, session () directly get_code () on ok when taking the CAPTCHA, and by the way session_star () must be put first when using session.

The copy code is as follows:

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