我希望文件名不是用户想要的名称，而是用户的用户名。正如您在下面的代码中看到的，我从会话中获得了用户的用户名。现在，我只想将其应用于$_FILES，但用$username替换$_FILES["fileToUpload"]["name"]并没有成功。我不确定我做错了什么，所以我把它改回来了。请看一看。
upload.php
<?php
include("functions.php");
session_start();
$username = $_SESSION['username'];
$target_dir = "uploads/";
$target_file = $target_dir . $_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"] . ".";
$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( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
goTo("home.php");
} else {
echo "Sorry, there was an error uploading your file.";
}
}
?>
您需要将$target_file变量更改为您想要的名称，因为这是传递到move_uploaded_file()中的内容。在你的代码中，我没有看到任何地方你真正将这个变量设置为他们的用户名（现在它仍然使用他们上传时选择的名称）。
在不过多修改现有代码的情况下，看起来你可以做到这一点：
$target_file = $target_dir . $username . '.' . $imageFileType;
在move_uploaded_file（$_FILES["fileToUpload"]["tmp_name"]，$target_file）之前输入以下代码：
添加代码：
//Here we will get the extension of the file being uploaded
$temp = explode(".",$_FILES["file"]["name"]);
//Here we provide the new name and append the extension
$target_file = $username.'.'.end($temp);
结果：当您调用move_uploaded_file（$_FILES["fileToUpload"]["tmp_name"]，$target_file）时，$targetfile名称将是我们分配给$_target_file的名称。