Set the external attributes of an entry defined by its index
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PHP Manual ZipArchive Set the external attributes of an entry defined by its index

ZipArchive::setExternalAttributesIndex

ZipArchive::setExternalAttributesIndex — Set the external attributes of an entry defined by its index

public ZipArchive::setExternalAttributesIndex(
    int $index,
    int $opsys,
    int $attr,
    int $flags = 0
): bool

Set the external attributes of an entry defined by its index.

index: Index of the entry.
opsys: The operating system code defined by one of the ZipArchive::OPSYS_ constants.
attr: The external attributes. Value depends on operating system.
flags: Optional flags. Currently unused.

Returns true on success or false on failure.