Description:
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Documentation for ZipArchive::getFromName is misleading.
The first parameter is actually a relative (to root of the archive) path, docs say "Name" which can falsely imply file would be found just by its filename, which doesn't happen when it is inside a directory.

To get to a deeper file, you must specify the path like:
$zip->getFromName('subFolderTest/test.txt');

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From manual page: https://php.net/ziparchive.getfromname
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Test script:
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//considering archive structure
//subFolderTest (d)
// - test.txt (f)
// - test2.txt (f)

$zip->getFromName('test.txt'); //this will not find anything
$zip->getFromName('subFolderTest/test.txt'); //this will find the file