function processImages($images){$uploadfiles = array();// make sure images array does not contain more than 3 imagesif (count($images) <= 3) {    foreach ($images as $image) {        $uploadfile = "NULL";        if ($image['size'] != 0) {            //file process            function doFileCheck($file, $image)            {                $imginfo_array = getimagesize($file);                /*getimagesize() only works with imagesif getimagesize() fails it will returnfalse you can use var_dump() to see insidethe array.echo var_dump($imginfo_array)  */                if ($imginfo_array !== false) {                    $uploaddir = './uploads/';                    $uploadfile = $uploaddir . basename($image['name']);                    if (file_exists($uploadfile)) {                        echo "<h3>That filename already exists - try again!</h3>";                    } else {                        if (move_uploaded_file($image['tmp_name'], $uploadfile)) {                            echo "<h3>File seems valid, and was successfully uploaded</h3>";                        } else {                            echo "INVALID! Possible file upload attack!\n";                        }                    }                    return $uploadfile;                }            }我有這個文件處理函數，問題是我得到一個異常，說只有變量應該通過引用傳遞。在第一種情況下，它會在 switch 語句中引發該異常，因為我正在嘗試上傳 jpeg 圖像，但我正在調試它并且找不到問題。我將一個數組傳遞給包含表單中每個文件（總共 3 個）的函數，然后遍歷文件以處理每個文件