如何测试用户是否选择了要上传的文件?

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($_FILES['logo']['name']) 和 if (isset($_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.

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