Methods and examples of generating verification codes in PHP

Since registration codes are often used during registration to prevent malicious registration of machines, here I publish a basic image that generates a picture verification code. It is very simple. Friends in need can refer to the

image. func.php

        

         Copy after login
        
       

string.func.php

strlen($chars)) { exit("字符串长度不够"); } /*打乱字符串*/ $chars=str_shuffle($chars); return substr($chars,0,$length); } ?>

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