图片总是上传失败，有人懂代码吗
<?phprequire_once("app.php");$app_hooks = array();$db = new DbHelpClass();$act = isset($_GET['act']) ? $_GET['act'] : '';if( isset($_FILES['picture']) && !empty($_FILES['picture']['name']) ){ if( !$admin ) { upmsg(1,'not login'); } else { if($_FILES['picture']['size'] > 5242880 ) { upmsg(1,'图片不能超过5M'); } else { $imgInfo = @getimagesize($_FILES['picture']['tmp_name']); if( !$imgInfo || !in_array($imgInfo, array(1,2,3)) ) { upmsg(1,'您上传的不是一张有效的图片'); exit(); } switch($imgInfo) { case 1: $fileType = ".gif"; break; case 2: $fileType = ".jpg"; break; case 3: $fileType = ".png"; break; } $savePath = date('Y/m'); $saveName = "_".date('His')."_".rand().$fileType; mkDirs(ROOT_PATH."assets/file/".$savePath); if($act == 'thum'){ $saveImage = ROOT_PATH."assets/file/".$savePath."/s".$saveName;}else{ $saveImage = ROOT_PATH."assets/file/".$savePath."/b".$saveName; } if( @move_uploaded_file($_FILES['picture']['tmp_name'], $saveImage) ) { if($act == 'thum'){ createImg($saveImage,$saveImage,$imgInfo,ImgW,ImgH,1); }else{ if( $imgInfo > $set['width'] || $imgInfo > $set['width'] ) { createImg($saveImage,$saveImage,$imgInfo,$set['width'],$set['width']); } //echo $saveImage; run_hook('upload',array('img'=>$saveImage)); } $resImage = str_replace(ROOT_PATH,'',$saveImage); upmsg(0,'',$resImage); } else { upmsg(1,'上传失败'); } } //end login else }}function upmsg($e,$m,$u=''){$arr['error'] = $e;$arr['message'] = $m;$arr['url']=$u;echo json_encode($arr);exit();}
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