剔除空数组 array_filter()

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示例:array:3 [▼  0 => UploadedFile {#316 ▶}  1 => UploadedFile {#317 ▶}  2 => null]
   dd(array_filter($file)) ;使用函数后输出:array:2 [▼  0 => UploadedFile {#316 ▶}  1 => UploadedFile {#317 ▶}]
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