CodeIgniter学习笔记五：分页，文件上传，session，验证码

一、分页

示例代码：

//装载类文件
$this -> load -> library('pagination');

$controller = $this->router->fetch_class();
$action = $this->router->fetch_method();

//每页显示10条数据，共有101条数据
$config['base_url'] = site_url("$controller/$action");
$config['total_rows'] = 101;
$config['per_page'] = 10;
$config['first_link'] = "首页";
$config['prev_link'] = "上一页";
$config['next_link'] = "下一页";
$config['last_link'] = "最后一页";

//如果setment不是3需要设置，默认为3
$config['uri_segment'] = 3;

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

//偏移量
$offset = intval($this -> uri -> segment(3));

$sql = "SELECT * FROM `TEST` LIMIT $offset," . $config['per_page'];

$pager = $this -> pagination -> create_links();

$this -> load -> view('article/index', array('pager' => $pager, 'sql' => $sql));

需要注意的是，如果配置了url中隐藏index.php，在site_url中生成的路径中默认还是有index.php，需要在application/config/config.php中改成如下配置：

$config['index_page'] = '';

即可。

二、文件上传

示例代码：

//目录需要手动创建
$config['upload_path'] = './uploads/';
$config['allowed_types'] = "gif|png|jpg|jpeg";
$config['max_size'] = 512;
$config['file_name'] = uniqid();

$this -> load -> library('upload', $config);
//pic为input type=file的name
$this -> upload ->do_upload('pic');

//上传文件信息
$uploadInfo = $this -> upload -> data();
var_dump($uploadInfo);
/*
array (size=14)
  'file_name' => string '55a61d04e96f4.jpg' (length=17)
  'file_type' => string 'image/jpeg' (length=10)
  'file_path' => string 'E:/wamp/www/citest/uploads/' (length=27)
  'full_path' => string 'E:/wamp/www/citest/uploads/55a61d04e96f4.jpg' (length=44)
  'raw_name' => string '55a61d04e96f4' (length=13)
  'orig_name' => string '55a61d04e96f4.jpg' (length=17)
  'client_name' => string 'hk.jpg' (length=6)
  'file_ext' => string '.jpg' (length=4)
  'file_size' => float 125.09
  'is_image' => boolean true
  'image_width' => int 675
  'image_height' => int 900
  'image_type' => string 'jpeg' (length=4)
  'image_size_str' => string 'width="675" height="900"' (length=24)
*/

即可。

三、session

1、开启

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

默认已经开启，用上面的代码加载session库。

2、写入

$user = array(
      'id' => 3,
      'name' => 'jim'
);
$this -> session -> set_userdata("user", $user);

3、读取

$this -> session -> userdata('user')

注：建议在 application/config/config.php 中配置加密key:

$config['encryption_key'] = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxx';

四、验证码

示例：

$this->load->helper('captcha');
$vals = array(
    //'word'          => 'Random word',
    'img_path'      => './captcha/',
    'img_url'       => base_url() . 'captcha/',
    //'font_path'     => './path/to/fonts/texb.ttf',
    'img_width'     => '200',
    'img_height'    => 80,
    'expiration'    => 60,
    'word_length'   => 10,
    'font_size'     => 26,
    'img_id'        => 'Imageid',
    'pool'          => '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',

    // White background and border, black text and red grid
    'colors'        => array(
            'background' => array(255, 255, 255),
            'border' => array(255, 255, 255),
            'text' => array(0, 0, 0),
            'grid' => array(255, 40, 40)
    )
);

$cap = create_captcha($vals);
var_dump($cap);
/*
array (size=4)
  'word' => string 'hFan3NM4xB' (length=10)
  'time' => float 1436954914.3053
  'image' => string '<img id="Imageid" src="http://localhost/citest/captcha/1436954914.3053.jpg" style="width: 200; height: 80; border: 0;" alt=" " />' (length=129)
  'filename' => string '1436954914.3053.jpg' (length=19)
*/
echo $cap['image'];

注意：需要手动创建存放验证码的文件夹，验证码图片会在超时后自动删除。