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50 lines
1.8 KiB
PHP
Executable File
50 lines
1.8 KiB
PHP
Executable File
<?php
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session_start(); //设置session
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$width = 150; //设置图片宽为300像素
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$height = 40; //设置图片高为40像素
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$image = imagecreatetruecolor($width, $height); //设置验证码大小的函数
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$bgcolor = imagecolorallocate($image, 255, 255, 255); //验证码颜色RGB为(255,255,255)#ffffff
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imagefill($image, 0, 0, $bgcolor); //区域填充
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$cap_code = "";
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for ($i = 0; $i < 4; $i++) {
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$fontsize = 12; //设置字体大小
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$fontcolor = imagecolorallocate($image, rand(0, 120), rand(0, 120), rand(0, 120));
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//数字越大，颜色越浅，这里是深颜色0-120
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$data = 'QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm1234567890'; //添加字符串
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$fontcontent = substr($data, rand(0, strlen($data)), 1); //去除值，字符串截取方法
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$cap_code .= $fontcontent; //.=连续定义变量
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$x = ($i * 150 / 4) + rand(5, 10);
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$y = rand(5, 10);
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//设置坐标
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imagestring($image, $fontsize, $x, $y, $fontcontent, $fontcolor);
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}
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$_SESSION['code'] = $cap_code; //存到session
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//设置干扰元素，设置雪花点
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for ($i = 0; $i < 300; $i++) {
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$inputcolor = imagecolorallocate($image, rand(50, 200), rand(20, 200), rand(50, 200));
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//设置颜色，20-200颜色比数字浅，不干扰阅读
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imagesetpixel($image, rand(1, 149), rand(1, 39), $inputcolor);
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//画一个单一像素的元素
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}
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//增加干扰元素，设置横线(先设置线的颜色，在设置横线)
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for ($i = 0; $i < 4; $i++) {
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$linecolor = imagecolorallocate($image, rand(20, 220), rand(20, 220), rand(20, 220));
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//设置线的颜色
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imageline($image, rand(1, 149), rand(1, 39), rand(1, 299), rand(1, 149), $linecolor);
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}
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//因为有些浏览器，访问的content-type会是文本型，所以我们需要设置成图片的格式类型
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header('Content-Type:image/png');
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imagepng($image); //建立png函数
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imagedestroy($image);
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