PHP上传 - 如何获取上传文件的相对路径？

Question

我的视频位于桌面上的文件夹中：

/home/john/Desktop/Samples/Vids/small.mp4

如何从上传或其他方式获取此文件路径？

这是我的html表单：

<form class="form-submission" method="post" action="upload.php" enctype= "multipart/form-data">
        <input type="file" name="upload[]" id="input-file" multiple required>
        <button type="submit" class="btn btn-default no-gradient">Submit</button>
</form>

upload.php的：

<?php
print_r($_FILES);

结果：

Array
(
    [upload] => Array
        (
            [name] => Array
                (
                    [0] => small.mp4
                )

            [type] => Array
                (
                    [0] => video/mp4
                )

            [tmp_name] => Array
                (
                    [0] => /tmp/php1KNwas
                )

            [error] => Array
                (
                    [0] => 0
                )

            [size] => Array
                (
                    [0] => 383631
                )

        )

)

但是没有路径信息 - /home/john/Desktop/Samples/Vids/small.mp4

任何想法我怎样才能得到它？

我需要找到视频文件路径，以便将其发送到我的YouTube频道：

// REPLACE this value with the path to the file you are uploading.
$videoPath = "/home/john/Desktop/Samples/Vids/small.mp4";

....

$media->setFileSize(filesize($videoPath));


// Read the media file and upload it chunk by chunk.
$status = false;
$handle = fopen($videoPath, "rb");
while (!$status && !feof($handle)) {
  $chunk = fread($handle, $chunkSizeBytes);
  $status = $media->nextChunk($chunk);
}

整个视频上传代码均来自google's。