CodeIgniter code example for uploading images

Share a piece of code for uploading images with CodeIgniter. It can be a reference for friends who study CodeIgniter, a PHP framework.

Use CodeIgniter’s upload class to upload images. Some problems were encountered during the test. Here are some things to pay attention to:

<?php echo form_open_multipart('picture/upload');?>
<?php echo form_upload('userfile');?>
/*注意，此处是userfile,$this->upload->do_upload(),这里do_upload默认上传文件的表单名为userfile;
当然也可以使用do_upload($filename)，此处的$filename一定要和form_upload()里面的字符串一致.
*/
<?php echo form_close();?>

controller controller code:

 function upload() {
$config['upload_path'] = './uploads/';
/*这里的uploads是相对于index.php的,也就是入口文件,这个千万不要弄错哦!
否则就会报错"The upload path does not appear to be valid.";
*/
$config['allowed_types'] = 'gif|jpg|png';
/*我试着去上传其它类型的文件,这里一定要注意顺序!
A problem was encountered while attempting to move the uploaded file to the final destination.
这个错误一般是上传文件的文件名不能是中文名,这个很郁闷!还未解决,大家可以用其它方法,重新改一下文件名就可以解决了! 
$config['allowed_types'] = 'zip|gz|png|gif|jpg';(正确)
$config['allowed_types'] = 'png|gif|jpg|zip|gz';(错误)
*/
$config['max_size'] = '1024';
$config['max_width']  = '1024';
$config['max_height']  = '768';

$config['file_name']  = time(); //文件名不使用原始名
$this->load->library('upload', $config);
if(!$this->upload->do_upload()) {
   echo $this->upload->display_errors();
}else{
     $data['upload_data']=$this->upload->data();  //文件的一些信息
     $img=$data['upload_data']['file_name'];  //取得文件名

     echo $img."<br>";

     foreach($data['upload_data'] as $item => $value){
     echo $item.":".$value."<br>";

    }
 }
}