Php 正在绕过空签入条件并正在运行

我有一个表单，用户可以附加一个文件并发送。我注意到，当用户提交没有附件的表单时，此条件仍在运行：

if (!empty($_FILES['uploadedFile']['name']) && $_FILES['uploadedFile']['error'] != 4)

由于文件名为空，我无法理解为什么要运行它

有人知道为什么这种情况仍然存在吗

   if ($_FILES['uploadedFile']['error'] == 1) {
        $error = "The file {$_POST['first_name']} attempted to upload is too large. Contact them for an alternate way to send this file.";
        $template = str_replace("{filename}", "$error", $template);
    }
    if (!empty($_FILES['uploadedFile']['name']) && $_FILES['uploadedFile']['error'] != 4) {
        $fu = new fileUpload();
        $filename = $fu->upload();
        $out = (count($filename) > 1 ? 'Multiple files were' : 'A file was'). '  uploaded. You can download ' . (count($filename) > 1 ? 'them' : 'the file'). ' from:</ul>';
        foreach ($filename as $indFile) {
             $out .= "<li><a href='/uploads/{$indFile}'>{$indFile}</a></li>";
        }
        $out .= '</ul>';
        $template = str_replace("{filename}", $out, $template);
        clearstatcache();
    } else {
        $template = str_replace("{filename}", "", $template);
    }

新代码：

foreach ($_FILES as $file) {
        foreach($file['name'] as $key => $value) {
            if ($value == "") { //empty string
                if($file['error'][$key] != 4) { //error code is not #4
                    //do your code here, I did not check your other code


                    echo "name is empty AND error is NOT 4";
                } else { //error code IS #4
                    echo "error code is 4";
                }
            } else {
                echo "name is NOT empty!";

                $fu = new fileUpload();
                    $filename = $fu->upload();
                    $out = (count($filename) > 1 ? 'Multiple files were' : 'A file was'). '  uploaded. You can download ' . (count($filename) > 1 ? 'them' : 'the file'). ' from:</ul>';
                    foreach ($filename as $indFile) {
                         $out .= "<li><a href='uploads/{$indFile}'>{$indFile}</a></li>";
                    }
                    $out .= '</ul>';
                    $template = str_replace("{filename}", $out, $template);
            }
        }
    }
    clearstatcache();

---

我认为问题在于你如何检查文件

下面的内容应该可以工作，而不必重做代码或实现高级错误处理

使用我根据转储外观构建的自定义$_FILES数组，将多个文件分解为多个数组，并将多个文件嵌套在“uploadedFile”方法下，它们都可以工作

方法1 方法2

---

您是否完成了var_dump$文件；如果提交时没有文件来检查它实际包含的内容，可以将其放在if语句之前。其实这并不重要，因为你说if语句的计算结果总是true。问题是你检查它的时候好像只得到一个文件，而你的表单是为多个文件设置的。检查['uploadedFile']['name']是否为空，而不是空的。它包含一个非空数组。好了，它包含一个非空数组。所以它本身不是空的…从输入名称中删除[]无论我把代码放在你说的地方，还是最后一个else语句中我认为应该放在的地方，因为名称不会是空的，文件应该上传，它仍然一直运行。你是否在表单中自然提交表单？或者使用JavaScript？Ajax提交。试试我上面编辑的版本，它会输出什么吗？其中一个骰子应该捕获它。带有此回显错误代码的else语句为4，正在输出。但是，它下面的else正在运行，因为我收到的电子邮件中包含了我的$out消息。我刚刚用我的代码更新了我的问题。

array(1) { 
  ["uploadedFile"]=> array(5) { 
     ["name"]=> array(1) { 
       [0]=> string(0) "" 
     } 
     ["type"]=> array(1) { 
       [0]=> string(0) "" 
     } 
     ["tmp_name"]=> array(1) { 
       [0]=> string(0) "" 
     } 
     ["error"]=> array(1) { 
       [0]=> int(4) 
     } 
     ["size"]=> array(1) { 
       [0]=> int(0) 
     } 
   } 
}

foreach ($_FILES as $file) {
        foreach($file['name'] as $key => $value) {
            if ($value == "") { //empty string
                if($file['error'][$key] != 4) { //error code is not #4
                    //do your code here, I did not check your other code


                    echo "name is empty AND error is NOT 4";
                } else { //error code IS #4
                    echo "error code is 4";
                }
            } else {
                echo "name is NOT empty!";

                $fu = new fileUpload();
                    $filename = $fu->upload();
                    $out = (count($filename) > 1 ? 'Multiple files were' : 'A file was'). '  uploaded. You can download ' . (count($filename) > 1 ? 'them' : 'the file'). ' from:</ul>';
                    foreach ($filename as $indFile) {
                         $out .= "<li><a href='uploads/{$indFile}'>{$indFile}</a></li>";
                    }
                    $out .= '</ul>';
                    $template = str_replace("{filename}", $out, $template);
            }
        }
    }
    clearstatcache();

$_FILES = array(
    'uploadedFile' => array(
        'name' => array(0 => ""), 
        'error' => array(0 => 2)
    ),
    'uploadedFile2' => array(
        'name' => array(0 => "aasd"), 
        'error' => array(0 => 4)
    ),
    'uploadedFile3' => array(
        'name' => array(0 => ""), 
        'error' => array(0 => 4)
    )
);

$_FILES = array(
    'uploadedFile' => array(
        'name' => array(
            0 => "",
            1 => "aasd",
            2 => ""
        ), 
        'error' => array(
            0 => 2,
            1 => 4,
            2 => 4
        )
        //...
    )
);

<?php
foreach ($_FILES as $file) {
    foreach($file['name'] as $key => $value) {
        if ($value != null) { //non-empty string
            if($file['error'][$key] != 4) { //error code is not #4
                die ("name is NOT empty AND error is NOT 4");
            } else { //error code IS #4
                die("error code is 4");
            }
        } else {
            die("name is EMPTY!");
        }
    }
}
?>