/**
* 生成验证码字符串，写入SESSION，将字符串图片返回给浏览器
*
* @param $len
* @param int $width
* @param int $height
* @param int $font_size
*/
public static function generate($len, $width = 110, $height = 30, $font_size = 18)
{
$sizes = array('18' => array('width' => 25, 'height' => 25));
$words = self::words($len);
$session_key = 'captcha';
//$_SESSION[$session_key] = strtolower($words);
Tools_help::setSession($session_key, strtolower($words));
$image = Files_ImageManager::createWhiteImage($width, $height);
$font_config = array('spacing' => -17, 'font' => '5.ttf');
$font_path = dirname(__FILE__) . '/' . $font_config['font'];
$color = imagecolorallocate($image, mt_rand(0, 100), mt_rand(20, 120), mt_rand(50, 150));
$rand = 0;
$w = $sizes[$font_size]['width'] * $len;
$h = $sizes[$font_size]['height'];
$x = round(($width - $w) / 2);
$y = round(($height + $h) / 2) - 6;
$coors = imagettftext($image, $font_size, $rand, $x, $y, $color, $font_path, $words);
if ($coors) {
header("Cache-Control: no-cache, must-revalidate");
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Pragma: no-cache");
header("Cache-control: private");
header('Content-Type: image/png');
imagepng($image);
imagedestroy($image);
}
exit;
}
/**
* 剪切图片
* @param $src_file
* @param $dst_file
* @param null $dst_width
* @param null $dst_height
* @param string $file_type
* @param int $dst_x
* @param int $dst_y
* @return bool
*/
public static function cut($src_file, $dst_file, $dst_width = null, $dst_height = null, $file_type = 'jpg', $dst_x = 0, $dst_y = 0)
{
if (!file_exists($src_file)) {
return false;
}
// Source information
$src_info = getimagesize($src_file);
$src = array('width' => $src_info[0], 'height' => $src_info[1], 'ressource' => Files_ImageManager::create($src_info[2], $src_file));
// Destination information
$dest = array();
$dest['x'] = $dst_x;
$dest['y'] = $dst_y;
$dest['width'] = !is_null($dst_width) ? $dst_width : $src['width'];
$dest['height'] = !is_null($dst_height) ? $dst_height : $src['height'];
$dest['ressource'] = Files_ImageManager::createWhiteImage($dest['width'], $dest['height']);
$white = imagecolorallocate($dest['ressource'], 255, 255, 255);
imagecopyresampled($dest['ressource'], $src['ressource'], 0, 0, $dest['x'], $dest['y'], $dest['width'], $dest['height'], $dest['width'], $dest['height']);
imagecolortransparent($dest['ressource'], $white);
$return = Files_ImageManager::write($file_type, $dest['ressource'], $dst_file);
return $return;
}
