42 lines
1.1 KiB
PHP
42 lines
1.1 KiB
PHP
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<?php
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/**
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* 图片验证码 http://www.phpxs.com/code/1002990/
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*/
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session_start();
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$num = 4; //验证码个数
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$width = 80; //验证码宽度
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$height = 20; //验证码高度
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$code = ' ';
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for ($i = 0; $i < $num; $i++) //生成验证码
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{
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switch (rand(0, 2)) {
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case 0:
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$code[$i] = chr(rand(48, 57));
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break; //数字
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case 1:
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$code[$i] = chr(rand(65, 90));
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break; //大写字母
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case 2:
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$code[$i] = chr(rand(97, 122));
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break; //小写字母
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}
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}
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$_SESSION["VerifyCode"] = $code;
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$image = imagecreate($width, $height);
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imagecolorallocate($image, 255, 255, 255);
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for ($i = 0; $i < 80; $i++) //生成干扰像素
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{
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$dis_color = imagecolorallocate($image, rand(0, 2555), rand(0, 255), rand(0, 255));
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imagesetpixel($image, rand(1, $width), rand(1, $height), $dis_color);
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}
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for ($i = 0; $i < $num; $i++) //打印字符到图像
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{
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$char_color = imagecolorallocate($image, rand(0, 2555), rand(0, 255), rand(0, 255));
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imagechar($image, 60, ($width / $num) * $i, rand(0, 5), $code[$i], $char_color);
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}
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header("Content-type:image/png");
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imagepng($image); //输出图像到浏览器
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imagedestroy($image);//释放资源
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