Get entry contents.

// $entryName = 'path/to/example-entry-name.txt';

$contents = $zipFile[$entryName];
Checks whether a entry exists.

// $entryName = 'path/to/example-entry-name.txt';

$hasEntry = isset($zipFile[$entryName]);

if the file exists, but it is empty (0 bytes), then an error is displayed
ErrorException (E_WARNING)
fread (): Length parameter must be greater than 0

I think this is not correct, since the file can be empty in the archive