Description:
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Ziparchive now is able to read the files inside a password protected zip file, but is yet unable to append new files to this package using the supplied password.

Test script:
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<?php
	$file = '/tmp/data';
	$data = array(1,2,3);
	file_put_contents($file,json_encode($data));
	$r = system('zip -P password file.zip /tmp/data');
	//$r = system('zip file.zip /tmp/data');

	$zip = new ZipArchive;
	$zip->open('file.zip');
	$r = $zip->setPassword('password');
	$data = $zip->getFromName('tmp/data');
	var_dump($data);

	/* Insert new file */
	$r = $zip->addFromString('tmp/test',json_encode($data));
	$data = $zip->getFromName('tmp/data');
	var_dump($data);

	unlink($file);
	$zip->close();

Expected result:
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The new file added is encrypted by the password you set.

Actual result:
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The file is currently not protected by any password