在我的项目中，我试图通过$ _FILES上传文件。但是当我检查$ _FILES的值时，它什么都没包含。我还附上我的PHP和HTML代码HTML：
<form id="insert_form" method="post" enctype="multipart/form-data">
<input type="file" name="fileToUpload" id="fileToUpload" />
<input class="btn btn-info" name="submit" type="submit" value="Insert" />
</form>
PHP：
$filename = $_FILES["fileToUpload"]['name'];
这是我基于表单提交点击的ajax调用
$('#insert_form').on('submit', function (event) {
event.preventDefault();
var form_data = $(this).serialize();
$.ajax({
url: 'next.php',
method: "POST",
data: form_data,
success: function (data) {
}
});
});
您可以尝试以下代码
的index.php
<!DOCTYPE html>
<html>
<body>
<form action="upload.php" method="post" enctype="multipart/form-data">
Select image to upload:
<input type="file" name="fileToUpload" id="fileToUpload">
<input type="submit" value="Upload Image" name="submit">
</form>
</body>
</html>并在upload.php上
<?php
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($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"] . ".";
$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.";
}
}
?>以上是具有各种验证的完整代码，您可以删除不需要的代码。