(PHP >= 7.2.0, PECL zip >= 1.14.0)
ZipArchive::setEncryptionIndex — Set the encryption method of an entry defined by its index
public ZipArchive::setEncryptionIndex ( int $index , int $method [, string $password ] ) : bool
Set the encryption method of an entry defined by its index.
index
Index of the entry.
method
The encryption method defined by one of the ZipArchive::EM_ constants.
password
Optional password, default used when missing.
Returns true
on success or false
on failure.
Note:
This function is only available if built against libzip ≥ 1.2.0.
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https://www.php.net/manual/en/ziparchive.setencryptionindex.php