'123467890', //'characters' => '2346789abcdefghjmnpqrtuxyzABCDEFGHJMNPQRTUXYZ', 'default' => [ 'length' => 4, // 启用科学计算后要改为 9 'width' => 90, 'height' => 43, 'quality' => 90, 'math' => FALSE, // 改为true,启用科学计算 ], 'flat' => [ 'length' => 6, 'width' => 160, 'height' => 46, 'quality' => 90, 'lines' => 6, 'bgImage' => FALSE, 'bgColor' => '#ecf2f4', 'fontColors' => ['#2c3e50', '#c0392b', '#16a085', '#c0392b', '#8e44ad', '#303f9f', '#f57c00', '#795548'], 'contrast' => -5, ], 'mini' => [ 'length' => 3, 'width' => 60, 'height' => 32, ], 'inverse' => [ 'length' => 5, 'width' => 120, 'height' => 36, 'quality' => 90, 'sensitive' => TRUE, 'angle' => 12, 'sharpen' => 10, 'blur' => 2, 'invert' => TRUE, 'contrast' => -5, ] ];