Laravel框架 -- uploadify文件上传判断格式和大小

<script type="text/javascript">
    <?php $timestamp = time();?>
    $(function() {
        $('#uploadFile').uploadify({
            'buttonText' : '上传素材',
            'formData'     : {
                'timestamp' : '<?php echo $timestamp;?>',
                '_token'     : '{{ csrf_token() }}'
            },
            'swf'      : "{{ asset('resources/org/uploadify/uploadify.swf') }}",
            'uploader' : "{{ url('admin/uploadFile') }}",
            'onUploadSuccess' : uploadFile,
        });
        function uploadFile(file, data) {
            var data = $.parseJSON(data);
            if(data.code==0){
                $("#error_msg").show();
                $("#error_msg").html(data.msg);
            }
            else{
                $("#error_msg").hide();
                $('input[name=fail_file]').val(data.path);
                $('input[name=fail_size]').val(data.size);
            }
        }
    });
</script>