如何测试用户是否已选择要上传的文件? [英] How to test if a user has SELECTED a file to upload?

问题描述

在页面上，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，如果用户希望在不上传LOGO的情况下编辑信息，则会引发错误:您必须上传正确类型的错误"

因此，如果用户未在输入框中添加任何内容以进行上传，则我不想输入这些条件测试.

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.

有什么想法吗?

edit:也许我不太清楚，我不想测试他是否上传了徽标，我想测试如果他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会提示您必须以正确的格式上传.

谢谢.

解决方案

您可以使用以下方法进行检查:

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

或者您可以使用Javascript结构，仅在上载字段具有除空字符串(")之外的其他值时才启用上载/提交按钮，从而避免提交完全不上载的表单.

on a page, i have :

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)) {
      // ...
    }
}

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'

So, if a user didn't put anything in the inputbox in order to upload it, i don't want to enter in these conditions test.

i tested : if (!empty($_FILES['logo']['name']) and if (isset($_FILES['logo']['name'])

but both doesn't seems to work.

Any ideas?

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.

thanks.

解决方案

You can check this with:

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

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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