CodeIgniter使用技巧

一、数据库备份与保存

$this->load->dbutil();

$backup =& $this->dbutil->backup();

$this->load->helper('file');

write_file('e:/mybackup.gz', $backup);

二、CI图像类 缩放,裁剪,旋转,水印(只可用在 GD/GD2)

$this->load->library('image_lib');

function do_image($image_name) {

$this->load->library('image_lib');

$config['image_library'] = 'GD';//选择图像库，还可以选ImageMagick

$config['source_image'] = "$image_name";

$config['maintain_ratio']  = TRUE;//当 maintain_ratio 选项设为可用时，生成的缩略图将在保持纵横比例的同时，尽可能的在宽度和高度上接近所设定的width和height

$config['width'] = 75;

$config['height'] = 50;

$config['new_image'] = 'newfolder/newname.png';//图片保存新名称

$config['create_thumb'] = TRUE;//是否生成缩略图

$this->image_lib->initialize($config);

if(!$this->image_lib->resize())

 {echo "failed";}

else{echo 'success!';}

}

添加水印函数wm_image

function wm_image(){

$this->load->library('image_lib');

$config['source_image'] = 'uploads/waltzer.jpg';

$config['wm_text'] = 'Copyright 2007 - David Upton';

$config['wm_type'] = 'text';//添加文本水印，overlay为添加图片水印

$this->image_lib->initialize($config);

if(!$this->image_lib->watermark())

{echo 'failure to watermark';}

else

{echo 'success';}

}

三、CI ZIP类压缩文件 示例为压缩图片，并下载

function zip_image()

{

$this->load->library('zip');

$this->zip->archive('my_backup.zip');

$path = 'uploads/waltzer1.jpg';

$this->zip->read_file($path);

$this->zip->download('my_backup.zip');

}

四、文件下载

$this->load->helper('download');

$data = file_get_contents("e:/mybackup.txt");//$data可为从数据库读取值

$name = 'backup.txt';
force_download($name, $data);

五、语言包加载

if($user_language_pref == 'german')
{$this->lang->load('welcome', 'german');}
elseif($user_language_pref == 'french')
{$this->lang->load('welcome', 'french');}

六、使用FTP类测试远程文件

function getremotefiles($hostname, $username, $password) {
   $this->load->library('ftp');
   $config['hostname'] = $hostname;
   $config['username'] = $username;   
   $config['password'] = $password;
   $config['debug']     = TRUE;
   $this->ftp->connect($config);
   $filelist = $this->ftp->list_files('/my_directory/');
   $this->ftp->close();
   return $list;  
}

七、程序不报错

 默认地， CI 在屏幕上显示所有的错误：error_reporting(E_ALL);

只要把这个改成：error_reporting(0);就不报错了