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
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<?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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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。