上传前无法更改文件名

Question

我有一个如下所示的PHP文件，并且尝试更改文件名并为其指定一个随机名称，然后使用来将其保存在服务器上

 $temp = explode(".",$_FILES["fileToUpload"]["name"]);
      $newfilename = rand(1,99999) . '.' .end($temp);
      move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file . $newfilename);

在以下代码中

HTML：

<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>

和upload.php PHP

<?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"] . ".";
        $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 {
  $temp = explode(".",$_FILES["fileToUpload"]["name"]);
  $newfilename = rand(1,99999) . '.' .end($temp);
  move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file . $newfilename);
}
?>

但这是将原始文件名test.png和123472.png组合在一起创建一个像test.png123472.png这样的文件！ 您能否让我知道为什么会发生这种情况以及如何解决？

Answer 1

问题在下一行

 move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file . $newfilename); 

而是在行上方使用以下行

 move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_dir. $newfilename); 

然后从您的代码中删除以下行：

 $target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]); 

Answer 2

请这样尝试

 $temp = explode(".",$_FILES["fileToUpload"]["name"][0]);
  $newfilename = rand(1,99999) . '.' .end($temp);