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我使用php-csv-parser从 csv 文件转换了 2 个数组。这是最旧的文件：

Array
(
[0] => Array
    (
        [0] => A Single Man
        [1] => Tom Ford
        [2] => 2009
        [3] => Somestring
    )

[1] => Array
    (
        [0] => Bram Stoker Dracula
        [1] => Francis F. Coppola
        [2] => 1992
        [3] => Somestring
    )
)

这是最新的：

Array
(
[0] => Array //this is a new record
    (
        [0] => A Single Man
        [1] => Tom Ford
        [2] => 1988
    )

[1] => Array //this record already exists in oldest array
    (
        [0] => A Single Man
        [1] => Tom Ford
        [2] => 2009
    )

[2] => Array //this record already exists but has a modify
    (
        [0] => Bram Stoker Dracula
        [1] => Francis Ford Coppola //modified string
        [2] => 1992
    )
)

我想创建第三个“合并”数组，其中包含新记录和修改后的字符串。请注意，如果Array[i][2]是不同的字符串，我必须创建一个新记录，但如果任何其他参数发生更改，只需修改记录。之后，对于每条新记录，我必须填写所有其他空参数。

这是预期的输出

Array
(
[0] => Array
    (
        [0] => A Single Man
        [1] => Tom Ford
        [2] => 1988
        [3] => //empty for now, to fill
    )

[1] => Array
    (
        [0] => A Single Man
        [1] => Tom Ford
        [2] => 2009
        [3] => Somestring
    )

[2] => Array
    (
        [0] => Bram Stoker Dracula
        [1] => Francis Ford Coppola
        [2] => 1992
        [3] => Somestring
    )
)
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