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        如何测试用户是否选择了要上传的文件?

        时间:2023-12-02
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                  本文介绍了如何测试用户是否选择了要上传的文件?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  在一个页面上,我有:

                  if (!empty($_FILES['logo']['name'])) {
                      $dossier     = 'upload/';
                      $fichier     = basename($_FILES['logo']['name']);
                      $taille_maxi = 100000;
                      $taille      = filesize($_FILES['logo']['tmp_name']);
                      $extensions  = array('.png', '.jpg', '.jpeg');
                      $extension   = strrchr($_FILES['logo']['name'], '.');
                  
                      if(!in_array($extension, $extensions)) {
                          $erreur = 'ERROR you  must upload the right type';
                      }
                  
                      if($taille>$taille_maxi) {
                           $erreur = 'too heavy';
                      }
                  
                      if(!empty($erreur)) {
                        // ...
                      }
                  }
                  

                  问题是,如果用户想在不上传LOGO的情况下编辑信息,则会引发错误:'error you must upload the right type'

                  The problem is, if the users wants to edit information WITHOUT uploading a LOGO, it raises an error : 'error you must upload the right type'

                  所以,如果用户没有在输入框中输入任何内容来上传它,我不想进入这些条件测试.

                  我测试过:if (!empty($_FILES['logo']['name'])if (isset($_FILES['logo']['name'])

                  但两者似乎都不起作用.

                  but both doesn't seems to work.

                  有什么想法吗?

                  也许我不是很清楚,我不想测试他是否上传了徽标,我想测试他是否选择了要上传的文件,因为现在,如果他没有选择文件要上传,php 会报错,告诉他必须以正确的格式上传.

                  edit : maybe i wasn't so clear, i don't want to test if he uploaded a logo, i want to test IF he selected a file to upload, because right now, if he doesn't select a file to upload, php raises an error telling he must upload with the right format.

                  谢谢.

                  推荐答案

                  您可以通过以下方式检查:

                  You can check this with:

                  if (empty($_FILES['logo']['name'])) {
                      // No file was selected for upload, your (re)action goes here
                  }
                  

                  或者您可以使用 javascript 构造,仅在上传字段的值不是空字符串 ("") 时才启用上传/提交按钮,以避免在根本不上传的情况下提交表单.

                  Or you can use a javascript construction that only enables the upload/submit button whenever the upload field has a value other then an empty string ("") to avoid submission of the form with no upload at all.

                  这篇关于如何测试用户是否选择了要上传的文件?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

                  上一篇:在 PHP 中将 JPG/GIF 图像转换为 PNG? 下一篇:最大文件数可以同时php上传

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