本文实例讲述了CI框架文件上传类及图像处理类用法。分享给大家供大家参考,具体如下:
//列表页banner图片 public function edit_list_page_banner($category_id=""){ $category_id= empty($category_id)?$_POST["category_id"]:$category_id; //上传图片 if(isset($_POST["key"]) && $_POST["key"] == "upload"){ /* 1.set_upload_path */ $config['upload_path']="./upload/source/".date("Y/m/d");//文件上传目录 if(!file_exists("./upload/source/".date("Y/m/d"))){ mkdir("./upload/source/".date("Y/m/d"),0777,true);//原图路径 } if(!file_exists("./upload/big_thumb/".date("Y/m/d"))){ mkdir("./upload/big_thumb/".date("Y/m/d"),0777,true);//大缩略图路径 } if(!file_exists("./upload/small_thumb/".date("Y/m/d"))){ mkdir("./upload/small_thumb/".date("Y/m/d"),0777,true);//小缩略图路径 } $config['allowed_types']="gif|jpg|png|txt";//文件类型 $config['max_size']="20000";//最大上传大小 $this->load->library("upload",$config); if($this->upload->do_upload('userfile'))//表单中name="userfile" { //上传成功之后,生成两张缩略图 $data=$this->upload->data();//返回上传图片的信息 $this->load->library("image_lib");//载入图像处理类库 //第一种方式:大缩略图的配置参数 /* $config_big_thumb['image_library'] = 'gd2';//gd2图库 $config_big_thumb['source_image'] = $data['full_path'];//原图 $config_big_thumb['new_image'] = "./upload/big_thumb/".date("Y/m/d")."/".$data['file_name'];//大缩略图 $config_big_thumb['create_thumb'] = true;//是否创建缩略图 $config_big_thumb['maintain_ratio'] = true; $config_big_thumb['width'] = 300;//缩略图宽度 $config_big_thumb['height'] = 300;//缩略图的高度 $config_big_thumb['thumb_marker']="_300_300";//缩略图名字后加上 "_300_300",可以代表是一个300*300的缩略图 */ //第二种:大缩略图的配置参数 /* $config_big_thumb=array( 'image_library' => 'gd2',//gd2图库 'source_image' => $data['full_path'],//原图 'new_image' => "./upload/big_thumb/".date("Y/m/d")."/".$data['file_name'],//大缩略图 'create_thumb' => true,//是否创建缩略图 'maintain_ratio' => true, 'width' => 300,//缩略图宽度 'height' => 300,//缩略图的高度 'thumb_marker'=>"_300_300"//缩略图名字后加上 "_300_300",可以代表是一个300*300的缩略图 ); */ //第三种方式:将部分配置信息放到了config.php文件中 $config_big_thumb=$this->config->item("config_big_thumb"); $config_big_thumb['source_image']=$data['full_path']; $config_big_thumb['new_image']="./upload/big_thumb/".date("Y/m/d")."/".$data['file_name']; //小缩略图的配置参数 /* $config_small_thumb['image_library'] = 'gd2';//gd2图库 $config_small_thumb['source_image'] = $data['full_path'];//原图 $config_small_thumb['new_image'] = "./upload/small_thumb/".date("Y/m/d")."/".$data['file_name'];//大缩略图 $config_small_thumb['create_thumb'] = true;//是否创建缩略图 $config_small_thumb['maintain_ratio'] = true; $config_small_thumb['width'] = 100;//缩略图宽度 $config_small_thumb['height'] = 100;//缩略图的高度 $config_small_thumb['thumb_marker']="_100_100";//缩略图名字后加上 "_100_100",可以代表是一个100*100的缩略图 */ //小缩略图的配置参数 $config_small_thumb=array( 'image_library' => 'gd2',//gd2图库 'source_image' => $data['full_path'],//原图 'new_image' => "./upload/small_thumb/".date("Y/m/d")."/".$data['file_name'],//大缩略图 'create_thumb' => true,//是否创建缩略图 'maintain_ratio' => true, 'width' => 100,//缩略图宽度 'height' => 100,//缩略图的高度 'thumb_marker'=>"_100_100"//缩略图名字后加上 "_300_300",可以代表是一个300*300的缩略图 ); //$this->load->library("image_lib",$config_thumb); $this->image_lib->initialize($config_big_thumb); $this->image_lib->resize();//生成big缩略图 $this->image_lib->initialize($config_small_thumb); $this->image_lib->resize();//生成small缩略图 //插入数据库 $data_array = array( 'category_id' => $category_id, 'pic_url' => "./upload/source/".date("Y/m/d")."/".$data['file_name'], 'addtime' => time(), 'is_stop' => 1, 'sort'=>0, 'gender' => $_POST["gender"], 'link_url'=>$_POST["link_url"], 'user_id' => intval($this->cur_user ['user_id']) ); $this->category_model->add_category_banner($data_array); } } $con_arr[] = " category_id= '{$category_id}'"; if ($gender=='' ) { $gender=0; } $con_arr[] = " gender= '{$gender}'"; $condition = implode( ' and ', $con_arr); $banner_list = $this->category_model->get_banner_all($condition); $this->tp->assign('banner_list', $banner_list); $this->tp->assign('base_url', base_url()); $this->tp->assign('gender', $gender); $this->tp->assign('category_id', $category_id); $this->tp->display("category/edit_list_page_banner.php"); }
config.php文件中有关缩略图的配置项:
//大缩略图的配置参数 $config_big_thumb=array( 'image_library' => 'gd2',//gd2图库 'create_thumb' => true,//是否创建缩略图 'maintain_ratio' => true, 'width' => 300,//缩略图宽度 'height' => 300,//缩略图的高度 'thumb_marker'=>"_300_300"//缩略图名字后加上 "_300_300",可以代表是一个300*300的缩略图 );
更多关于CodeIgniter相关内容感兴趣的读者可查看本站专题:《codeigniter入门教程》、《CI(CodeIgniter)框架进阶教程》、《php优秀开发框架总结》、《ThinkPHP入门教程》、《ThinkPHP常用方法总结》、《Zend FrameWork框架入门教程》、《php面向对象程序设计入门教程》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》
希望本文所述对大家基于CodeIgniter框架的PHP程序设计有所帮助。

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.


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