thinkphp - upload new images and delete old images

【Foreword】

   This article introduces how to implement thinkphp - uploading new images and deleting old images

 

【main body】

   The principle is very simple, similar to the upload operation principle. However, a delete action was added before uploading.

(1) Add an operation to the controller

//addData method
		public function addData($post,$file){
			// Determine if there is a file to upload
			if($file['error'] == '0'){
				//1. Configuration array, define configuration
				$cfg = array(
					//Configure the upload path
					'rootPath'	=>	WORKING_PATH . UPLOAD_ROOT_PATH
				);
				$upload = new \Think\Upload($cfg);//2. Instantiate the upload class
				$info = $upload->uploadOne($file);//3. Upload operation and accept the upload result
				if ($info) {
					//Original image path, complete the field after success
					$post['picture'] = UPLOAD_ROOT_PATH . $info['savepath'] . $info['savename'];
					$post['filename'] = $info['name'];//Original name of the file
					$post['hasfile'] = 1;//Is there a file
					// make thumbnail
					$image = new \Think\Image(); //1. Instantiate the class
					$imgPath = WORKING_PATH.$post['picture'];//2. Open the picture and pass the picture path. Use the root path uniformly
					$image->open($imgPath);
					$image->thumb(100,100);//3. Make thumbnails, scale proportionally
					//4. Save the image, pass in the path -- full path (absolute path directory + file name)
					$image->save(WORKING_PATH.UPLOAD_ROOT_PATH.$info['savepath'].'thumb_'.$info['savename']);
					$post['thumb'] = UPLOAD_ROOT_PATH.$info['savepath'].'thumb_'.$info['savename'];//5. Complete the thumb field
				}
			}
			// Completion field addtime
			$post['addtime'] = time();
			//add operation
			return $this->add($post);
		}

(2) Update operation

//update data save
		public function updateData($post,$file){
			if(!$file['error']){
				$cfg = array(
					'rootPath' => WORKING_PATH.UPLOAD_ROOT_PATH
				);
				$fileInfo = M('article')->where('id='.$post['id'])->find();
				$string1=$fileInfo['thumb'];
				$thumb=substr_replace($string1,'',0,15);
				unlink(WORKING_PATH.UPLOAD_ROOT_PATH.$thumb);//Delete the original thumb
				$string2=$fileInfo['picture'];
				$picture=substr_replace($string2,'',0,15);
				unlink(WORKING_PATH.UPLOAD_ROOT_PATH.$picture);//Delete the original picture
				// upload new attachment
				$upload = new \Think\Upload($cfg);
				$info = $upload->uploadOne($file);
				if($info){
					$post['picture'] = UPLOAD_ROOT_PATH . $info['savepath'] . $info['savename'];
					$post['filename'] = $info['name'];//Original name of the file
					$post['hasfile'] = 1;
					// make thumbnail
					$image = new \Think\Image();
					$imgPath = WORKING_PATH.$post['picture'];
					$image->open($imgPath);
					$image->thumb(100,100);
					$image->save(WORKING_PATH.UPLOAD_ROOT_PATH.$info['savepath'].'thumb_'.$info['savename']);
					$post['thumb'] = UPLOAD_ROOT_PATH.$info['savepath'].'thumb_'.$info['savename'];//5. Complete the thumb field
				}else{
					//upload failed
				}
			}else{
				// If there is no file, do not process
			}

 

【Summarize】

   ①The place marked in red above is to delete the original image

   ②Knowledge point: Does php remove the first few characters without knowing how long the string is?

$string='string';
$subject=substr_replace(string,'',0,3);

   Here I define the working path in the entry file, so I need to intercept the concatenated string

//define the working path
define('WORKING_PATH', str_replace('\\','/',__DIR__));
//Define the upload root directory
define('UPLOAD_ROOT_PATH', '/Public/Upload/');

 

 

 

 

 

 

 

 

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