使用php将文件上载到网站
我是php新手,正在尝试从这里修改代码: 上传文件后保持在同一页面 页面显示这些错误(在上载文件之前,但不是在上载文件之后): 不管怎样,文件都可以正常上传 代码如下:使用php将文件上载到网站,php,Php,我是php新手,正在尝试从这里修改代码: 上传文件后保持在同一页面 页面显示这些错误(在上载文件之前,但不是在上载文件之后): 不管怎样,文件都可以正常上传 代码如下: <!DOCTYPE html> <html> <body> <form action="<?php $_SERVER['PHP_SELF'] ?>" method="post" enctype="multipart/form-data"> Select ima
<!DOCTYPE html>
<html>
<body>
<form action="<?php $_SERVER['PHP_SELF'] ?>" method="post" enctype="multipart/form-data">
Select image to upload:
<input type="file" name="fileToUpload" id="fileToUpload" class="upload_file">
<input type="submit" value="Upload Image" name="submit">
</form>
<?php
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if image file is a actual image or fake image
if(isset($_POST["submit"]))
{
$check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
if($check !== false)
{
echo "File is an image - " . $check["mime"] . ".";
echo '<a href="'.$target_file.'">Download you file here</a>';
$uploadOk = 1;
}
else
{
echo "File is not an image.";
$uploadOk = 0;
}
}
// Check if file already exists
if (file_exists($target_file))
{
echo "Sorry, file already exists.";
$uploadOk = 0;
}
// Check file size
if ($_FILES["fileToUpload"]["size"] > 500000)
{
echo "Sorry, your file is too large.";
$uploadOk = 0;
}
// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"&& $imageFileType != "gif" )
{
echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
$uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0)
{
echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
}
else
{
if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file))
{
echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
}
else
{
echo "Sorry, there was an error uploading your file.";
}
}
?>
</body>
</html>
检查此代码-它现在不应该抛出错误
<!DOCTYPE html>
<html>
<body>
<form action="<?php $_SERVER['PHP_SELF'] ?>" method="post" enctype="multipart/form-data">
Select image to upload:
<input type="file" name="fileToUpload" id="fileToUpload" class="upload_file">
<input type="submit" value="Upload Image" name="submit">
</form>
<?php
// Check if image file is a actual image or fake image
if(isset($_POST["submit"]))
{
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
$check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
if($check !== false)
{
echo "File is an image - " . $check["mime"] . ".";
echo '<a href="'.$target_file.'">Download you file here</a>';
$uploadOk = 1;
}
else
{
echo "File is not an image.";
$uploadOk = 0;
}
// Check if file already exists
if (file_exists($target_file))
{
echo "Sorry, file already exists.";
$uploadOk = 0;
}
// Check file size
if ($_FILES["fileToUpload"]["size"] > 500000)
{
echo "Sorry, your file is too large.";
$uploadOk = 0;
}
// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"&& $imageFileType != "gif" )
{
echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
$uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0)
{
echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
}
else
{
if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file))
{
echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
}
else
{
echo "Sorry, there was an error uploading your file.";
}
}
}
?>
</body>
</html>
您需要移动此块
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
并将条件之后的所有内容放入if(isset($\u POST[“submit”])
条件
首次下载页面时,
$\u文件是空的,但您希望使用它。您应该在代码中区分何时通过GET加载页面(加载表单)以及何时发出POST请求以及何时需要处理上载。这适用于与文件上载相关的所有事项
我通常也会将所有处理放在顶部,如果您想重定向,例如在成功发布后,这可能会很有用:
if ($_SERVER['REQUEST_METHOD'] === 'POST')
{
// your upload processing code
}
else
{
// show your form
}
查看您的代码行:
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
替换为:
if (isset($_FILES["fileToUpload"]["name"])) {
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
} else {
var_dump($_FILES);
$target_file = '';
}
这不是一个完整的解决方案,代码中可能会有许多其他错误,但只是从某个地方开始在代码开始执行之前,您必须检查$\u FILES
数组是否已设置或未使用isset()
函数。顺便说一句,您无法区分文件类型及其扩展名,你犯了一个大错误。请使用method=“post”
。问题是,他想在条件之外使用$\u文件。@lolka\u bolka是的,我刚刚注意到。这仍然是一个更干净的方法,所以我会让它继续下去。太棒了,谢谢。我理解它是如何发送这些错误的。我在这个问题上陷得太久了
if (isset($_FILES["fileToUpload"]["name"])) {
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
} else {
var_dump($_FILES);
$target_file = '';
}