file_get_contents():文件名不能为空(上传文件为可选)

时间:2017-03-16 01:06:37

标签: php html mysql

我是php的新手。我在php中创建了一个简单的上传表单。这是我的代码。

<html><head></head>
<body>

<form method="post" action="" enctype="multipart/form-data">

    Upload File:
    <input type="file" name="upload" /><br> 
    <input type="submit" name="submit" value="Submit"/>
</form>
</body>
</html>

<?php
include("config.php");

if(isset($_POST['submit'])  )
{


$filename = $con->real_escape_string($_FILES['upload']['name']);
$filedata= $con->real_escape_string(file_get_contents($_FILES['upload']['tmp_name']));
$filetype = $con->real_escape_string($_FILES['upload']['type']);
$filesize = intval($_FILES['upload']['size']);

if ($_FILES['upload']['name'] == 0 ){

echo "<br><br> New record created successfully";

}

else {

    $query = "INSERT INTO contracts(`filename`,`filedata`, `filetype`,`filesize`) VALUES ('$filename','$filedata','$filetype','$filesize')" ;

    if ($con->query($query) === TRUE) {
    echo "<br><br> New record created successfully";
    } else {
    echo "Error:<br>" . $con->error;
    }

}
$con->close(); 
}   

?>

工作正常。但是如果我按下没有附加文件的提交,它会显示错误,警告:file_get_contents():在第20行的C:\ xampp \ htdocs \ contractdb \ filetest.php中,文件名不能为空。

我希望上传文件是可选的,因为并非每个用户都有要附加的文件。我还希望用户在上传后下载文件而不删除file_get_contents($ _ FILES [&#39; upload&#39;] [&#39; tmp_name&#39;])。

我该怎么做?

2 个答案:

答案 0 :(得分:1)

您的检查应该在调用file_get_content()之前进行,这样就不会抛出错误,只有在文件输入不为空时才调用该函数:

if(isset($_POST['submit'])  ) {

if ($_FILES['upload']['size'] != 0 ) {

  $filename = $con->real_escape_string($_FILES['upload']['name']);
  $filedata= $con->real_escape_string(file_get_contents($_FILES['upload']
  ['tmp_name']));
  $filetype = $con->real_escape_string($_FILES['upload']['type']);
  $filesize = intval($_FILES['upload']['size']);


  $query = "INSERT INTO contracts(`filename`,`filedata`, `filetype`,`filesize`) VALUES ('$filename','$filedata','$filetype','$filesize')" ;

  if ($con->query($query) == TRUE) {
   echo "<br><br> New record created successfully";
  } else {
   echo "Error:<br>" . $con->error;
  }

 } 

 else {
   echo 'error: empty file';
 }
}

答案 1 :(得分:0)

试试这个:

if (isset($_POST['submit']) & ($_FILES['upload']['name']!=''))
{
    // Statement
}