$str = 'abcdefghijkmnpqrstuvwzxyABCDEFGKMNPQRSTUVWXYZ23456789';
$code = substr(str_shuffle($str), 0, 5);
//2块画布
$src = imagecreatetruecolor(60, 25);
$dst = imagecreatetruecolor(60, 25);
//准备背景颜色
$sgray = imagecolorallocate($src, 200, 200, 200);
$dgray = imagecolorallocate($src, 200, 200, 200);
$sblue = imagecolorallocate($src, 0, 0, 255);
//填充颜色
imagefill($src, 0, 0, $sgray);
imagefill($dst, 0, 0, $dgray);
//写字
imagestring($src, 5, 5, 4, $code, $sblue);
for ($i = 0; $i < 60; $i++) {
//根据正弦曲线计算上下波动的posY
$offset = 4;
//最大波动几个像素
$round = 2;
//扭2个周期，即4PI
$posY = round(sin($i * $round * M_PI / 60) * $offset);
//关键公式在这里
imagecopy($dst, $src, $i, $posY, $i, 0, 1, 25);
}
header('Content-Type:image/jpeg');
imagejpeg($dst);
}
}
//SecurityCode
SecurityCode::code();
function getSecurityCode($addResult)
{
$scc = new SecurityCode();
return $scc->getCode($addResult);
}