(PHP 5 >= 5.2.0, PHP 7, PECL zip >= 1.5.0)
ZipArchive::getNameIndex — Returns the name of an entry using its index
public ZipArchive::getNameIndex ( int $index [, int $flags ] ) : string|false
Returns the name of an entry using its index.
index
Index of the entry.
flags
 If flags is set to ZipArchive::FL_UNCHANGED, the original unchanged name is returned. 
 Returns the name on success or false on failure. 
Example #1 ZipArchive::getNameIndex() example
<?php
if ($zip->open('test.zip') == TRUE) {
 for ($i = 0; $i < $zip->numFiles; $i++) {
     $filename = $zip->getNameIndex($i);
     // ...
 }
}
?> 
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    https://www.php.net/manual/en/ziparchive.getnameindex.php