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Verification code library

php verification code class ValidateCode

Verification code library

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php verification code class ValidateCode I saw on the Internet that using ValidateCode written in PHP to generate a verification code class, I feel good about it, so I used it to analyze and learn. $charset is a random factor. Here, several characters that are difficult to distinguish are removed, such as letters "i, l, o, q" and numbers "0,1". If necessary, you can add some Chinese or other characters or calculations, etc.

When generating verification code text on an image, the position of the text on the image and the color of each text are mainly considered.

Control the x-axis position of the n-th text = (image width / verification code length) * (n-1) random offset number; where n = {d1....n}

Control the y-axis position of the nth text = image height / 2 random offset number;

mt_rand(0, 156) randomly selects the text color. The purpose of 0-156 is to select a darker color.

mt_rand(-30, 30) Random text rotation.

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