|
|
|
|
|
<?php
|
|
|
|
|
|
session_start();
|
|
|
|
|
|
$image = imagecreatetruecolor(100, 30);//imagecreatetruecolor函数建一个真彩色图像
|
|
|
|
|
|
//生成彩色像素
|
|
|
|
|
|
$bgcolor = imagecolorallocate($image, 255, 255, 255);//白色背景 imagecolorallocate函数为一幅图像分配颜色
|
|
|
|
|
|
$textcolor = imagecolorallocate($image, 0, 0, 255);//蓝色文本
|
|
|
|
|
|
//填充函数，xy确定坐标，color颜色执行区域填充颜色
|
|
|
|
|
|
imagefill($image, 0, 0, $bgcolor);
|
|
|
|
|
|
$captch_code = "";//初始空值
|
|
|
|
|
|
//该循环,循环取数
|
|
|
|
|
|
for ($i = 0; $i < 4; $i++) {
|
|
|
|
|
|
$fontsize = 8;
|
|
|
|
|
|
$x = ($i * 25) + rand(5, 10);
|
|
|
|
|
|
$y = rand(5, 10);//位置随机
|
|
|
|
|
|
$data = strtoupper('abcdefghijkmnpqrstuvwxyz3456789');
|
|
|
|
|
|
$fontcontent = substr($data, rand(0, strlen($data) - 1), 1);//strlen仅仅是一个计数器的工作 含数字和字母的验证码
|
|
|
|
|
|
//可以理解为数组长度0到30
|
|
|
|
|
|
|
|
|
|
|
|
$fontcolor = imagecolorallocate($image, rand(0, 100), rand(0, 100), rand(0, 100));//随机的rgb()值可以自己定
|
|
|
|
|
|
|
|
|
|
|
|
imagestring($image, $fontsize, $x, $y, $fontcontent, $fontcolor); //水平地画一行字符串
|
|
|
|
|
|
$captch_code .= $fontcontent;
|
|
|
|
|
|
}
|
|
|
|
|
|
$_SESSION['authcode'] = $captch_code;//将变量保存再session的authcode变量中
|
|
|
|
|
|
//该循环,循环画背景干扰的点
|
|
|
|
|
|
/*for($m=0;$m<=600;$m++){
|
|
|
|
|
|
|
|
|
|
|
|
$x2=rand(1,99);
|
|
|
|
|
|
$y2=rand(1,99);
|
|
|
|
|
|
$pointcolor=imagecolorallocate($image,rand(0,255),rand(0,255),rand(0,255));
|
|
|
|
|
|
imagesetpixel($image,$x2,$y2,$pointcolor);// 水平地画一串像素点
|
|
|
|
|
|
}*/
|
|
|
|
|
|
|
|
|
|
|
|
//该循环,循环画干扰直线
|
|
|
|
|
|
/*for ($i=0;$i<=10;$i++){
|
|
|
|
|
|
$x1=rand(0,99);
|
|
|
|
|
|
$y1=rand(0,99);
|
|
|
|
|
|
$x2=rand(0,99);
|
|
|
|
|
|
$y2=rand(0,99);
|
|
|
|
|
|
$linecolor=imagecolorallocate($image,rand(0,255),rand(0,255),rand(0,255));
|
|
|
|
|
|
imageline($image,$x1,$y1,$x2,$y2,$linecolor);//画一条线段
|
|
|
|
|
|
|
|
|
|
|
|
}*/
|
|
|
|
|
|
header('content-type:image/png');
|
|
|
|
|
|
imagepng($image);
|
|
|
|
|
|
//销毁
|
|
|
|
|
|
imagedestroy($image);
|
|
|
|
|
|
?>
|
