PHP 生成验证码图片

显示全部楼层 · 2021-4-3 16:33

/**
* 验证码类
*/
class VeriCode
{
// 获取验证码配置
private static function _getCodeConfig()
{
return [
// 验证码字符集
'codeStr' => 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789',
// 验证码个数
'codeCount' => 4,
// 字体大小
'fontsize' => 25,
// 验证码的宽度
'width' => 130,
// 验证码高度
'height' => 36,
// 是否有干扰点?true有,false没有
'disturbPoint' => false,
// 干扰点个数,disturbPoint开启后生效
'pointCount' => 1,
// 是否有干扰条?true有,false没有
'disturbLine' => false,
// 干扰条个数,disturbLine开启后生效
'lineCount' => 9
];
}
// 创建图片验证码
public static function create()
{
// 配置
$config = self::_getCodeConfig();
//创建画布
$image = imagecreatetruecolor($config['width'], $config['height']);
//背景颜色
$bgcolor = imagecolorallocate($image, 255, 255, 255);
imagefill($image, 0, 0, $bgcolor);
$captch_code = '';//存储验证码
$captchCodeArr = str_split($config['codeStr']);
//随机选取4个候选字符
for ($i = 0; $i < $config['codeCount']; $i ) {
$fontsize = $config['fontsize'];
$fontcolor = imagecolorallocate($image, rand(0, 120), rand(0, 120), rand(0, 120));//随机颜色
$fontcontent = $captchCodeArr[rand(0, strlen($config['codeStr']) - 1)];
$captch_code .= $fontcontent;
$_x = $config['width'] / $config['codeCount'];
$x = ($i * (int)$_x) rand(5, 10); //随机坐标
$y = rand(5, 10);
imagestring($image, $fontsize, $x, $y, $fontcontent, $fontcolor); // 水平地画一行字符串
}
session_start();
$_SESSION['code'] = $captch_code;
//增加干扰点
if ($config['disturbPoint']) {
for ($i = 0; $i < $config['pointCount']; $i ) {
$pointcolor = imagecolorallocate($image, rand(50, 200), rand(50, 200), rand(50, 200));
imagesetpixel($image, rand(1, 99), rand(1, 29), $pointcolor);
}
}
//增加干扰线
if ($config['disturbLine']) {
for ($i = 0; $i < $config['lineCount']; $i ) {
$linecolor = imagecolorallocate($image, rand(80, 280), rand(80, 220), rand(80, 220));
imageline($image, rand(1, 99), rand(1, 29), rand(1, 99), rand(1, 29), $linecolor);
}
}
//输出格式
header('content-type:image/png');
imagepng($image);
//销毁图片
imagedestroy($image);
}