php 如何在PHP中限制文件上传类型文件大小？
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How to limit file upload type file size in PHP?
提问by Michael
I have an upload form and am checking the file size and file type to limit the uploaded file to 2 megabytes and either .pdf, .jpg, .gif or .png file types. My goal is to have an alert message displayed to the user if they violate one of these rules.
我有一个上传表单，正在检查文件大小和文件类型，以将上传的文件限制为 2 兆字节和 .pdf、.jpg、.gif 或 .png 文件类型。我的目标是在用户违反这些规则之一时向用户显示警报消息。
There are four scenarios:
有四种情况：
- Correct Size / Correct Type (working)
- Correct Size / INCORRECT Type (working)
- INCORRECT Size / Correct Type (not working)
- INCORRECT Size / INCORRECT Type (not working)
- 正确的尺寸/正确的类型（工作）
- 正确的尺寸/不正确的类型（工作）
- 不正确的尺寸/正确的类型（不起作用）
- 不正确的尺寸/不正确的类型（不工作）
With my current code, it always displays the incorrect "type" message when the file size is greater than 2 megabytes (#4), even if the file type is correct (#3).
使用我当前的代码，当文件大小大于 2 兆字节 (#4) 时，它总是显示不正确的“类型”消息，即使文件类型正确 (#3)。
Any ideas why?
任何想法为什么？
if (isset ( $_FILES['uploaded_file'] ) ) {
$file_size = $_FILES['uploaded_file']['size'];
$file_type = $_FILES['uploaded_file']['type'];
if (($file_size > 2097152)){
$message = 'File too large. File must be less than 2 megabytes.';
echo '<script type="text/javascript">alert("'.$message.'");</script>';
}
elseif (
($file_type != "application/pdf") &&
($file_type != "image/jpeg") &&
($file_type != "image/jpg") &&
($file_type != "image/gif") &&
($file_type != "image/png")
){
$message = 'Invalid file type. Only PDF, JPG, GIF and PNG types are accepted.';
echo '<script type="text/javascript">alert("'.$message.'");</script>';
}
else {
store_uploaded_file($id);
}
}
回答by Bailey Parker
Something that your code doesn't account for is displaying multiple errors. As you have noted above it is possible for the user to upload a file >2MB of the wrong type, but your code can only report one of the issues. Try something like:
您的代码没有考虑到的事情是显示多个错误。正如您在上面指出的那样，用户可能上传了错误类型的 >2MB 的文件，但您的代码只能报告其中一个问题。尝试类似：
if(isset($_FILES['uploaded_file'])) {
$errors = array();
$maxsize = 2097152;
$acceptable = array(
'application/pdf',
'image/jpeg',
'image/jpg',
'image/gif',
'image/png'
);
if(($_FILES['uploaded_file']['size'] >= $maxsize) || ($_FILES["uploaded_file"]["size"] == 0)) {
$errors[] = 'File too large. File must be less than 2 megabytes.';
}
if((!in_array($_FILES['uploaded_file']['type'], $acceptable)) && (!empty($_FILES["uploaded_file"]["type"]))) {
$errors[] = 'Invalid file type. Only PDF, JPG, GIF and PNG types are accepted.';
}
if(count($errors) === 0) {
move_uploaded_file($_FILES['uploaded_file']['tmpname'], '/store/to/location.file');
} else {
foreach($errors as $error) {
echo '<script>alert("'.$error.'");</script>';
}
die(); //Ensure no more processing is done
}
}
Look into the docs for move_uploaded_file()(it's called move not store) for more.
查看文档move_uploaded_file()（称为移动而不是存储）了解更多信息。
回答by IamLitto
Hope this helps :-)
希望这可以帮助 ：-）
if(isset($_POST['submit'])){
ini_set("post_max_size", "30M");
ini_set("upload_max_filesize", "30M");
ini_set("memory_limit", "20000M");
$fileName='product_demo.png';
if($_FILES['imgproduct']['size'] > 0 &&
(($_FILES["imgproduct"]["type"] == "image/gif") ||
($_FILES["imgproduct"]["type"] == "image/jpeg")||
($_FILES["imgproduct"]["type"] == "image/pjpeg") ||
($_FILES["imgproduct"]["type"] == "image/png") &&
($_FILES["imgproduct"]["size"] < 2097152))){
if ($_FILES["imgproduct"]["error"] > 0){
echo "Return Code: " . $_FILES["imgproduct"]["error"] . "<br />";
} else {
$rnd=rand(100,999);
$rnd=$rnd."_";
$fileName = $rnd.trim($_FILES['imgproduct']['name']);
$tmpName = $_FILES['imgproduct']['tmp_name'];
$fileSize = $_FILES['imgproduct']['size'];
$fileType = $_FILES['imgproduct']['type'];
$target = "upload/";
echo $target = $target .$rnd. basename( $_FILES['imgproduct']['name']) ;
move_uploaded_file($_FILES['imgproduct']['tmp_name'], $target);
}
} else {
echo "Sorry, there was a problem uploading your file.";
}
}
回答by JimmyBanks
If you are looking for a hard limit across all uploads on the site, you can limit these in php.ini by setting the following:
如果您正在寻找对网站上所有上传的硬限制，您可以通过设置以下内容在 php.ini 中限制这些：
`upload_max_filesize = 2M` `post_max_size = 2M`
`upload_max_filesize = 2M` `post_max_size = 2M`
that will set the maximum upload limit to 2 MB
这会将最大上传限制设置为 2 MB
回答by Hari Krishnan
Hope This useful...
希望这有用...
form:
形式：
<form action="check.php" method="post" enctype="multipart/form-data">
<label>Upload An Image</label>
<input type="file" name="file_upload" />
<input type="submit" name="upload"/>
</form>
check.php:
检查.php：
<?php
if(isset($_POST['upload'])){
$maxsize=2097152;
$format=array('image/jpeg');
if($_FILES['file_upload']['size']>=$maxsize){
$error_1='File Size too large';
echo '<script>alert("'.$error_1.'")</script>';
}
elseif($_FILES['file_upload']['size']==0){
$error_2='Invalid File';
echo '<script>alert("'.$error_2.'")</script>';
}
elseif(!in_array($_FILES['file_upload']['type'],$format)){
$error_3='Format Not Supported.Only .jpeg files are accepted';
echo '<script>alert("'.$error_3.'")</script>';
}
else{
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["file_upload"]["name"]);
if(move_uploaded_file($_FILES["file_upload"]["tmp_name"], $target_file)){
echo "The file ". basename($_FILES["file_upload"]["name"]). " has been uploaded.";
}
else{
echo "sorry";
}
}
}
?>
回答by websky
var sizef = document.getElementById('input-file-id').files[0].size;
if(sizef > 210000){
alert('sorry error');
}else {
//action
}
