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李二狗 — @Meniny
Published 12:02 Feb 02, 2012.
Created by @ezra. Categorized in #Programming, and tagged as #PHP.
Source format: Markdown
除了前面介绍的内容，简单的验证码图片也是很常见的。
通常为了提高安全性，验证码图片中除了数字与字母外还有一些干扰信息，例如横线、噪点等。线条绘制在前面已经说过，这一篇我们来介绍一种简单的噪点生成方法。
for ($i = 0;$i < 50;$i++) {
imagesetpixel($img, rand(0, 100) , rand(0, 100) , $red);
imagesetpixel($img, rand(0, 100) , rand(0, 100) , $blue);
}
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