我正在尝试上传图片，如下所示w3schools但它总是显示错误
Undefined index: file
这是代码
的HTML
<form action="upload.php" method="post" enctype="multipart/form-data">
<!-- Upload image -->
<input type="file" name="file" id="file">
<input type="submit" value="Upload Image" name="submit">
</form>
的PHP
<?php
if(!isset($_POST["submit"])){
die('Error');
}
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["file"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
if(isset($_POST["submit"])) {
$check = getimagesize($_FILES["file"]["tmp_name"]);
if($check !== false) {
echo "File is an image - " . $check["mime"] . ".";
$uploadOk = 1;
} else {
echo "File is not an image.";
$uploadOk = 0;
}
}
if (file_exists($target_file)) {
echo "Sorry, file already exists.";
$uploadOk = 0;
}
if ($_FILES["file"]["size"] > 500000) {
echo "Sorry, your file is too large.";
$uploadOk = 0;
}
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
$uploadOk = 0;
}
if ($uploadOk == 0) {
echo "Sorry, your file was not uploaded.";
} else {
if (move_uploaded_file($_FILES["file"]["tmp_name"], $target_file)) {
echo "The file ". basename( $_FILES["file"]["name"]). " has been uploaded.";
} else {
echo "Sorry, there was an error uploading your file.";
}
}
?>
如果您使用的是WAMP或XAMPP，则设置了文件上传限制。如果文件大小大于2mb，则上传将不起作用。尝试上传大小小于2mb的图像，看看是否可以使用。要更改文件上传限制，请打开您的php.ini文件并修改此值
upload_max_filesize = 2M
用您希望提供的限制替换2M，例如6M或8M
以下链接说明有关更改文件上传限制PHP更改最大上传文件大小
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