PHP method to generate clickable refresh verification code and simple example

This article mainly introduces the verification code generated by PHP that can be clicked to refresh. It analyzes the implementation and call display method of PHP verification code in the form of simple examples. It involves the related skills of dynamically calling the verification code PHP file with js. Friends who need it can For reference,

is as follows:

html file:

   
   换一张  

Verification code file gd.php:

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