PHP生成随机图片验证码类分享
PHP常用功能类 - 生成随机图片验证码
分享一个php实现的随机图片图片验证码封装类，一个最简单的生成随机验证码图片的例子，适合正在学习OOP面向对象编程以及PHP随机图片验证码生成的同学。
<?php class Verify{
public function show() {
$len = 5;
$str = "ABCDEFGHIJKLNMPQRSTUVWXYZ123456789";
$im = imagecreatetruecolor ( 70, 20 );
$bgc = imagecolorallocate($im, 255, 255, 255);
$bgtxt = imagecolorallocate($im, 220, 220, 220);
//随机调色板
$colors = array(
imagecolorallocate($im, 255, 0, 0),
imagecolorallocate($im, 0, 200, 0),
imagecolorallocate($im, 0, 0, 255),
imagecolorallocate($im, 0, 0, 0),
imagecolorallocate($im, 255, 128, 0),
imagecolorallocate($im, 255, 208, 0),
imagecolorallocate($im, 98, 186, 245),
);
//填充背景色
imagefill($im, 0, 0, $bgc);
//随机获取数字
$verify = "";
while (strlen($verify) < $len) {
$i = strlen($verify);
$random = $str[rand(0, strlen($str))];
$verify .= $random;
//绘制背景文字
imagestring($im, 6, ($i*10)+3, rand(0,6), $random, $bgtxt);
//绘制主文字信息
imagestring($im, 6, ($i*10)+3, rand(0,6), $random, $colors[rand(0, count($colors)-1)]);
}
//添加随机杂色
for($i=0; $i<100; $i++) {
$color = imagecolorallocate($im, rand(50,220), rand(50,220), rand(50,220));
imagesetpixel($im, rand(0,70), rand(0,20), $color);
}
//将验证码存入$_SESSION中
$_SESSION["verify"] = $verify;
//输出图片并释放缓存
header("Content-type: image/png");
imagepng($im);
imagedestroy($im);
}
}
// 使用方法
$verify = new Verify;
$verify->show();
?>本文只是简单实现了随机图片验证码，如果你想定制自己的图片样式，只需要根据注释中的语句，调整颜色即可。
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