php实现图片上传、剪切功能

本文实例为大家详细介绍了php实现图片上传、剪切功能的具体代码，供大家参考，具体内容如下

    <?php
    defined('BASEPATH') OR exit('No direct script access allowed');

    class Index extends MY_Controller {
      function __construct(){
        parent::__construct();
        $this->load->helper(array('form', 'url'));
      }

      /**
       * 首页
       */
      public function index() {
        $this->load->view('upload_form', array('error' => ' ' ));
      }


      public function do_upload()
      {
        $config['upload_path']   = './data/uploads/';
        $config['allowed_types']  = 'gif|jpg|png';
        $config['max_size']   = 100;
        $config['max_width']    = 1024;
        $config['max_height']    = 768;

        $this->load->library('upload', $config);

        if ( ! $this->upload->do_upload('userfile'))
        {
          $error = array('error' => $this->upload->display_errors());

          $this->load->view('upload_form', $error);
        }
        else
        {
          $data = array('upload_data' => $this->upload->data());

          $this->load->library('image_lib');      
          list($width, $height) = getimagesize($data['upload_data']['full_path']);
          $config['image_library'] = 'gd2';
          $config['source_image'] = $data['upload_data']['full_path'];
          $config['maintain_ratio'] = TRUE;
          if($width >= $height)
          {
            $config['master_dim'] = 'height';
          }else{
            $config['master_dim'] = 'width';
          }
          $config['width'] = 180;
          $config['height'] = 180;
          $this->image_lib->initialize($config);
          $this->image_lib->resize();

          $config['maintain_ratio'] = FALSE;
          if($width >= $height)
          {
            $config['x_axis'] = floor(($width * 180 / $height - 180)/2);
          }else{
            $config['y_axis'] = floor(($height * 180 / $width - 180)/2);
          }
          $this->image_lib->initialize($config);
          $this->image_lib->crop();

          $this->load->view('upload_success', $data);
        }
      }
    }

以上就是本文的全部内容，希望对大家学习php程序设计有所帮助。