php基于CodeIgniter实现图片上传、剪切功能

<?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);
}
}
}

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