<?php /** * 功能： 单张，多张图片上传，生成缩略图 * Class ImgUpload */ class ImgUpload { private $file; //文件信息 private $fileList; //文件列表 private $inputName; //标签名称 private $uploadPath; //上传路径 private $fileMaxSize; //最大尺寸 private $uploadFiles; //上传文件 //允许上传的文件类型 private $allowExt = array('bmp', 'jpg', 'jpeg', 'png', 'gif'); /** *@param $inputName input标签的name属性 *@param $uploadPath 文件上传路径 */ public function __construct($inputName, $uploadPath) { $this->inputName = $inputName; $this->uploadPath = $uploadPath; $this->fileList = array(); $this->file = $file = array( 'name' => null, 'type' => null, 'tmp_name' => null, 'size' => null, 'errno' => null, 'error' => null ); } /** * 设置允许上传的图片后缀格式 *@param $allowExt 文件后缀数组 */ public function setAllowExt($allowExt) { if (is_array($allowExt)) { $this->allowExt = $allowExt; } else { $this->allowExt = array($allowExt); } } /** * 设置允许上传的图片规格 *@param $fileMaxSize 最大文件尺寸 */ public function setMaxSize($fileMaxSize) { $this->fileMaxSize = $fileMaxSize; } /** * 获取上传成功的文件数组 *@return mixed */ public function getUploadFiles() { return $this->uploadFiles; } /** * 得到文件上传的错误信息 *@return array|mixed */ public function getErrorMsg() { if (count($this->fileList) == 0) { return $this->file['error']; } else { $errArr = array(); foreach ($this->fileList as $item) { array_push($errArr, $item['error']); } return $errArr; } } /** * 初始化文件参数 *@param $isList */ private function initFile($isList) { if ($isList) { foreach ($_FILES[$this->inputName] as $key => $item) { for ($i = 0; $i < count($item); $i++) { if ($key == 'error') { $this-> fileList[$i]['error'] = null; $this->fileList[$i]['errno'] = $item[$i]; } else { $this->fileList[$i][$key] = $item[$i]; } } } } else { $this->file['name'] = $_FILES[$this->inputName]['name']; $this->file['type'] = $_FILES[$this->inputName]['type']; $this->file['tmp_name'] = $_FILES[$this->inputName]['tmp_name']; $this->file['size'] = $_FILES[$this->inputName]['size']; $this->file['errno'] = $_FILES[$this->inputName]['error']; } } /** * 上传错误检查 *@param $errno *@return null|string */ private function errorCheck($errno) { switch ($errno) { case UPLOAD_ERR_OK: return null; case UPLOAD_ERR_INI_SIZE: return '文件尺寸超过服务器限制'; case UPLOAD_ERR_FORM_SIZE: return '文件尺寸超过表单限制'; case UPLOAD_ERR_PARTIAL: return '只有部分文件被上传'; case UPLOAD_ERR_NO_FILE: return '没有文件被上传'; case UPLOAD_ERR_NO_TMP_DIR: return '找不到临时文件夹'; case UPLOAD_ERR_CANT_WRITE: return '文件写入失败'; case UPLOAD_ERR_EXTENSION: return '上传被扩展程序中断'; } } /** * 上传文件校验 *@param $file *@throws Exception */ private function fileCheck($file) { //图片上传过程是否顺利 if ($file['errno'] != 0) { $error = $this->errorCheck($file['errno']); throw new Exception($error); } //图片尺寸是否符合要求 if (!empty($this->fileMaxSize) && $file['size'] > $this->fileMaxSize) { throw new Exception('文件尺寸超过' . ($this->fileMaxSize / 1024) . 'KB'); } //图片类型是否符合要求 $ext = pathinfo($file['name'], PATHINFO_EXTENSION); if (!in_array($ext, $this->allowExt)) { throw new Exception('不符合要求的文件类型'); } //图片上传方式是否为HTTP if (!is_uploaded_file($file['tmp_name'])) { throw new Exception('文件不是通过HTTP方式上传的'); } //图片是否可以读取 if (!getimagesize($file['tmp_name'])) { throw new Exception('图片文件损坏'); } //检查上传路径是否存在 if (!file_exists($this->uploadPath)) { mkdir($this->uploadPath, null, true); } } /** * 单文件上传，成功返回true *@return bool */ public function acceptSingleFile() { $this->initFile(false); try { $this->fileCheck($this->file); // $md_name = md5(uniqid(microtime(true), true)) . '.' . pathinfo($this->file['name'], PATHINFO_EXTENSION); // 简单设置图片名 $md_name = uniqid() . '.' . pathinfo($this->file['name'], PATHINFO_EXTENSION); if (move_uploaded_file($this->file['tmp_name'], $this->uploadPath . $md_name)) { $this->uploadFiles = array($this->uploadPath . $md_name); } else { throw new Exception('文件上传失败'); } } catch (Exception $e) { $this->file['error'] = $e->getMessage(); } finally { if (file_exists($this->file['tmp_name'])) { unlink($this->file['tmp_name']); } } return empty($this->file['error']) ? true : false; } /** * 多文件上传，全部成功返回true *@return bool */ public function acceptMultiFile() { $this->initFile(true); $this->uploadFiles = array(); for ($i = 0; $i < count($this-> fileList); $i++) { try { $this->fileCheck($this->fileList[$i]); $ext = pathinfo($this->fileList[$i]['name'], PATHINFO_EXTENSION); // $md_name = md5(uniqid(microtime(true), true)) . '.' . $ext; // 简单设置图片名 $md_name = uniqid() . '.' . $ext; if (move_uploaded_file($this->fileList[$i]['tmp_name'], $this->uploadPath . $md_name)) { array_push($this->uploadFiles, $this->uploadPath . $md_name); } else { throw new Exception('文件上传失败'); } } catch (Exception $e) { $this->fileList[$i]['error'] = $e->getMessage(); } finally { if (file_exists($this->fileList[$i]['tmp_name'])) { unlink($this->fileList[$i]['tmp_name']); } } } foreach ($this->fileList as $item) { if (!empty($item['error'])) { return false; } } return true; } /** * 生成缩略图： *@param $picName 图片名. 为上传后图片的完整路径. 获取： $imgUpload->getUploadFiles()[0] *@param $max_w 缩略图宽度 *@param $max_h 缩略图高度 *@param $pre 缩缩略图前缀 *@return bool */ public function imgUpdateSize($picName, $max_w=100, $max_h=100, $pre='_s'){ #1 获取图片的基本信息 $info = getimagesize($picName); $w = $info[0]; $h = $info[1]; #2 获取图片的类型 switch ($info[2]){ case 1: #gif $im = imagecreatefromgif($picName); break; case 2: #jpeg $im = imagecreatefromjpeg($picName); break; case 3: #png $im = imagecreatefrompng($picName); break; default : die('image style error!'); } #3 计算缩放比例 if(($max_w/$w) > ($max_h/$h)){ $b = $max_h/$h; }else{ $b = $max_w/$w; } #4 计算缩放后的尺寸 $nw = floor($w*$b); $nh = floor($h*$b); #5 创建一个新的图像源 -目标画布 $nim = imagecreatetruecolor($nw, $nh); # 等比例缩放 imagecopyresampled($nim, $im, 0, 0, 0, 0, $nw, $nh, $w, $h); #6 输出图片 -按源图像的类型输出 $picInfo = pathinfo($picName); #解析源图像的名子与路径信息 $new_picName = $picInfo['dirname'].'/'.$picInfo['filename'] .$pre.'.'.$picInfo['extension']; #拼装新图像名 switch ($info[2]){ case 1: #gif imagejpeg($nim, $new_picName); break; case 2: #jpeg imagejpeg($nim, $new_picName); break; case 3: #png imagepng($nim, $new_picName); break; default : die('image style error!'); } #7 释放图片资源 imagedestroy($im); imagedestroy($nim); return $new_picName; } }
