// 画图像
$im = imagecreatetruecolor($width, $height);
// 定义要用到的颜色
$back_color = imagecolorallocate($im, 235, 236, 237);
$boer_color = imagecolorallocate($im, 118, 151, 199);
$text_color = imagecolorallocate($im, mt_rand(0, 200), mt_rand(0, 120), mt_rand(0, 120));
// 画背景
imagefilledrectangle($im, 0, 0, $width, $height, $back_color);
// 画边框
imagerectangle($im, 0, 0, $width - 1, $height - 1, $boer_color);
// 画干扰线
for ($i = 0; $i < 5; $i++) {
$font_color = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
imagearc($im, mt_rand(-$width, $width), mt_rand(-$height, $height), mt_rand(30, $width * 2), mt_rand(20, $height * 2), mt_rand(0, 360), mt_rand(0, 360), $font_color);
}
// 画干扰点
for ($i = 0; $i < 50; $i++) {
$font_color = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $font_color);
}
// 画验证码
@imagefttext($im, $size, 0, 5, $size + 3, $text_color, 'simsunb.ttf', $code);
$_SESSION[$sess_name] = $code;
header("Cache-Control: max-age=1, s-maxage=1, no-cache, must-revalidate");
header("Content-type: image/png");
imagepng($im);
imagedestroy($im);
}
session_start();
vcode(isset($_REQUEST["name"]) ? $_REQUEST["name"] : "VerifyCode", 4, 15);
//4个数字，显示大小为15
//dechex — 十进制转换为十六进制
}
//把生成的验证码保存在SESSION超级全局数组中
$_SESSION['captcha'] = $code;
//创建画布
$img = imagecreatetruecolor($width, $high);
//填充背景色为白色
$backcolor = imagecolorallocate($img, '255', '255', '255');
imagefill($img, '0', '0', $backcolor);
//添加黑色边框
$bordercolor = imagecolorallocate($img, 0, 0, 0);
imagerectangle($img, 0, 0, $width - 1, $high - 1, $bordercolor);
//随机画线条
for ($i = 0; $i < $line_num; $i++) {
imageline($img, mt_rand(0, $width * 0.1), mt_rand(0, $high), mt_rand($width * 0.9, $width), mt_rand(0, $high), imagecolorallocate($img, mt_rand(150, 255), mt_rand(150, 255), mt_rand(150, 255)));
}
//随机打雪花
for ($i = 0; $i < $snow_num; $i++) {
imagechar($img, 1, mt_rand(0, $width), mt_rand(0, $high), '*', imagecolorallocate($img, mt_rand(200, 255), mt_rand(200, 255), mt_rand(200, 255)));
}
//画验证码
for ($b = 0; $b < strlen($_SESSION['captcha']); $b++) {
imagechar($img, 5, $b * $width / $num + mt_rand(5, 10), mt_rand(2, $high / 2), $_SESSION['captcha'][$b], imagecolorallocate($img, mt_rand(10, 150), mt_rand(10, 150), mt_rand(0, 100)));
}
ob_clean();
//清空输出缓冲区
imagepng($img);
imagedestroy($img);
}
vcode(85, 50, 5);
$im = imagecreatetruecolor($width, $height);
// 准备颜色
$bgcolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
$fontcolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
$interpixelcolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
$interlinecolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
// 填充画板
imagefill($im, 0, 0, $bgcolor);
// 准备文字
$strarr = array_merge(range(0, 9), range(a, z), range(A, Z));
shuffle($strarr);
$str = join('', array_slice($strarr, 0, $vstrnum));
// 将验证码的值保存到session里
$_SESSION['vcode'] = $str;
$angle = 0;
//角度
imagettftext($im, $fontsize, $angle, $x, $y, $fontcolor, $fontfile, $str);
for ($i = 0; $i < $interpixelnum; $i++) {
imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $interpixelcolor);
}
for ($i = 0; $i < $interlinenum; $i++) {
imageline($im, mt_rand(0, $width), mt_rand(0, $height), mt_rand(0, $width), mt_rand(0, $height), $interlinecolor);
}
// 输出图片
header("content-type:image/png;charset=utf8");
imagepng($im);
// 关闭资源
imagedestroy($im);
}
vcode(100, 30, 20, 25, 'fonts/simkai.ttf', 22, 0, 4, 300, 5);
<?php session_start(); include_once 'inc/vcode.inc.php'; $_SESSION['vcode'] = vcode(100, 40, 30, 4);