上传等比例压缩图片

如果图片超过php.ini的文件大小的话就提示图片过大 如果图片超过2m就等比例压缩图片0.9
------------------------------------------------------------------------
如果 upload_max_filesize==10M
 就会报如下的错
<br />
<b>Fatal error</b>:  Allowed memory size of 239075328 bytes exhausted (tried to allocate 32768 bytes) in <b>F:\SVN\b2c_shop\app\include\lib_image.class.php</b> on line <b>442</b><br />

需要将php.ini的memory_limit = 516M
------------------------------------------------------------------
如果 upload_max_filesize==5M 就可以正常上传

/*** 上传文件到CDN，必须在upload目录* rsync_upload.pass 文件owner必须为www-data,权限必须为600* @param $upload_relative_path //相对路径* @return bool*/function upload_cdn_file($upload_relative_path){//  $GLOBALS['_CFG']['CDN_UPLOAD_PATH'] = root@10.10.87.207::upload  ;$cdn_upload_path = $GLOBALS['_CFG']['CDN_UPLOAD_PATH'];if (!$cdn_upload_path) return true;if (!file_exists(ROOTDIR . $upload_relative_path)) return false;if (strpos($upload_relative_path, "upload/") !== 0) return false;$relative_file = substr($upload_relative_path, 7);$rsync_cmd = "cd " . ROOTDIR . "upload/ && /usr/bin/rsync {$relative_file} -zvrtopgR --password-file=" . ROOTDIR . "install/rsync_upload.pass {$cdn_upload_path}";@shell_exec($rsync_cmd);return true;}

public function upload(){$img = new lib_image('tmp_upload');$elname = $_POST['elname'];Log::LOG('image', print_r($_FILES, true));Log::LOG('image', print_r($_POST, true));//UPLOAD_ERR_INI_SIZE   值：1; 上传的文件超过了 php.ini 中 upload_max_filesize选项限制的值if ($_FILES[$elname]['error'][0]==1) {make_json_error('图片过大，请重新选择图片！');}else{if (lib_image::file_type($_FILES[$elname]['type'][0]) == '') {make_json_error('upload_image_format_novalid');}$path = $img->upload_file($_FILES[$elname]['tmp_name'][0], $_FILES[$elname]['type'][0]);if ($path == '') {make_json_error('upload_image_failed');}upload_cdn_file($path);if(intval($_FILES[$elname]['size'][0])>1048576){lib_image::image_png_size_add($path,$path);}log::log('image_png_size_add','image_path:'.print_r($path,true));$url = lib_util::get_image_url($path);$dim = lib_image::img_wh(ROOTDIR . $path);$rst = array('url' => $url, 'path' => $path, 'width' => $dim['width'], 'height' => $dim['height']);make_json_response($rst, 0);}}

    /*** desription 压缩图片* @param sting $imgsrc 图片路径* @param string $imgdst 压缩后保存路径*/static function image_png_size_add($imgsrc,$imgdst){list($width,$height,$type)=getimagesize($imgsrc);$new_width = $width*0.9;$new_height =$height*0.9;switch($type){case 1:$giftype=check_gifcartoon($imgsrc);if($giftype){header('Content-Type:image/gif');$i4000mage_wp=imagecreatetruecolor($new_width, $new_height);$image = imagecreatefromgif($imgsrc);imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);imagejpeg($image_wp, $imgdst,75);imagedestroy($image_wp);}break;case 2:header('Content-Type:image/jpeg');$image_wp=imagecreatetruecolor($new_width, $new_height);$image = imagecreatefromjpeg($imgsrc);imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);imagejpeg($image_wp, $imgdst,75);imagedestroy($image_wp);break;case 3:header('Content-Type:image/png');$image_wp=imagecreatetruecolor($new_width, $new_height);$image = imagecreatefrompng($imgsrc);imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);imagejpeg($image_wp, $imgdst,75);imagedestroy($image_wp);break;}}/*** desription 判断是否gif动画* @param sting $image_file图片路径* @return boolean t 是 f 否*/static function check_gifcartoon($image_file){$fp = fopen($image_file,'rb');$image_head = fread($fp,1024);fclose($fp);return preg_match("/".chr(0x21).chr(0xff).chr(0x0b).'NETSCAPE2.0'."/",$image_head)?false:true;}