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checkcode.php
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checkcode.php
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<?php
//checkcode.php
//开启session
session_start();
//宽
$w = 60;
//高
$h = 40;
//新建一个真彩色图像
$image = imagecreatetruecolor($w, $h);
//设置验证码颜色
$bgcolor = imagecolorallocate($image,255,255,255);
//填充背景色
imagefill($image, 0, 0, $bgcolor);
//10>设置变量
$captcha_code = "";
//随机种子
$char_str = '23456789';
$char_str_len = strlen($char_str)-1;
$checkcode = $code = '';
//生成随机码
for($i=0;$i<2;$i++){
//设置字体大小
$fontsize = 5;
//设置字体颜色,随机颜色
$fontcolor = imagecolorallocate($image, rand(0,120),rand(0,120), rand(0,120));
//设置数字
$code = substr($char_str,rand(0,$char_str_len),1);
//拼接验证码
$checkcode .= $code;
//随机码宽度
$x = ($i*$w/2)+rand(5,10);
//随机码高度
$y = rand(5,$h/2);
imagestring($image,$fontsize,$x,$y,$code,$fontcolor);
}
//保存code到session
$_SESSION['checkcode'] = $checkcode;
//设置雪花点
for($i=0;$i<100;$i++){
//设置点的颜色
$pointcolor = imagecolorallocate($image,rand(50,200), rand(50,200), rand(50,200));
//imagesetpixel画一个单一像素
imagesetpixel($image, rand(0,$w), rand(0,$h), $pointcolor);
}
//增加干扰元素
for($i=0;$i<0;$i++){
//设置线的颜色
$linecolor = imagecolorallocate($image,rand(80,220), rand(80,220),rand(80,220));
//设置线,两点一线
imageline($image,rand(1,$w-1), rand(1,$h-1),rand(1,$w-1), rand(1,$h-1),$linecolor);
}
//设置图片头部
header('Content-Type: image/png');
//生成png图片
imagepng($image);
//销毁$image
imagedestroy($image);
?>