如何上传单张图片到指定平台？

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使用layer的弹窗上传功能，编写public function upload()函数。函数检查文件上传错误，若无错误，返回成功信息；若有错误，返回失败信息。代码示例：

phppublic function upload() { if ($$_FILES[file][error]==0) { $result=['state'=> 0, 'msg'=> '上传成功', 'filename'=> '']; } else { $time=date('Y-m-d', time()); $uploaddir=str_replace('\\', '/', 'upl'); }}

public function upload() { if ($_FILES["file"]["error"] > 0){ $result = [ 'state' => 0, 'msg' => '上传失败', 'filename' => '', ]; }else{ $time=date ('Y-m-d',time ()); $uploaddir = str_replace ('\\', '/', 'uploads/'.$time.'/'); is_dir ($uploaddir)||mkdir ($uploaddir,0777,true); //获取当前图片的格式 $type = strrchr ($_FILES["file"]['name'], '.'); //将当前时间戳和图片格式拼接起来，形成图片路径 $fileDate = time ().$type; $uploadfile = $uploaddir.$fileDate; if (move_uploaded_file ($_FILES['file']['tmp_name'], $uploadfile)){ $result = [ 'state' => 1, 'msg' => '上传成功', 'filename' => $uploadfile, ]; }else{ $result = [ 'state' => 0, 'msg' => '上传失败', 'filename' => $uploadfile, ]; } } return json ($result); }