通过Imgur上传多个文件

Question

我正在使用此代码一次上传多个文件，但它无法正常工作。它根本不会触发;

<form action="imgur.php" method="post" enctype="multipart/form-data">
  Send these files:<br />
  <input name="file[]" type="file" multiple="multiple" onchange="upload(this.files[0])" />
</form>

<?php 
foreach ($_FILES['file']['tmp_name'] as $index => $tmpName) {
    if( !empty( $tmpName ) && is_uploaded_file( $tmpName ) )
    {
?>
<script type="text/javascript">
    window.ondragover = function(e) {e.preventDefault()}
    window.ondrop = function(e) {e.preventDefault(); upload(e.dataTransfer.files[0]); }
    function upload(file) {


        if (!file || !file.type.match(/image.*/)) return;


        document.body.className = "uploading";


        var fd = new FormData();
        fd.append("image", file);
        var xhr = new XMLHttpRequest();
        xhr.open("POST", "https://api.imgur.com/3/image.json");
        xhr.onload = function() {
            var code = JSON.parse(xhr.responseText).data.link + '\n';
            var editor = eval('opener.' + 'clickableEditor');
            editor.performInsert(code);
            javascript:window.close()
        }

        xhr.setRequestHeader('Authorization', 'Client-ID [MY-CLIENT-ID]');

        xhr.send(fd);
    }
</script>

<?php
}
}
?>

此代码粘贴的文件名称为imgur.php

请帮忙！