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FILE in PHP

本质上还是 http 的 post multipart/form-data 提交文件,到 PHP 的$_FILE变量取文件:

    [attachment] => Array
        (
            [name] => Screenshot from 2019-03-09 23-29-01.png
            [type] => image/png
            [tmp_name] => /tmp/phpdGwZGU
            [error] => 0
            [size] => 11005
        )