In the process of building a website, users often need to verify the verification code and other operations, such as registering, logging in, commenting, obtaining resources, etc. on the one hand, it can verify whether the current user’s behavior is a crawler, robot, etc., which will have an impact on the website data statistics; On the other hand, it can prevent users from brushing a large number of resources, resulting in server resource tension or even downtime; Now the application of verification code in forms is more and more, but it is always inconvenient to implement it with JS, so it can be implemented with PHP.
Request parameters: num, text
Parameter Description: where num is the number of characters of the verification code to be output; Text is the content in the picture of the verification code to be output
PHP source code is as follows:
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