$value = $_SESSION[$key] = str_pad(mt_rand(0, 9999), 4, '0', STR_PAD_LEFT);
session_write_close();
// 生成验证码图
header('Content-type: image/png');
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache -Control: no-store, no-cache , must-revalidate");
header("Cache -Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache ");
$im = imagecreate(47, 17);
$color = imagecolorallocate($im, 255, 255, 255);
imagefill($im, 0, 0, $color);
$color = imagecolorallocate($im, 255, 0, 0);
imagestring($im, 5, 5, 1, $value, $color);
imagepng($im);
imagedestroy($im);
} else {
// 返回验证码号
session_start();
$value = isset($_SESSION[$key]) ? $_SESSION[$key] : null;
unset($_SESSION[$key]);
session_write_close();
return $authcode === $value;
}
}
}
/**
* 执行(execute)
*/
front::stub() and front::main();