Try using the zip://
wrapper:
$handle = fopen('zip://test.zip#test.txt', 'r');
$result="";
while (!feof($handle)) {
$result .= fread($handle, 8192);
}
fclose($handle);
echo $result;
You can use file_get_contents
too:
$result = file_get_contents('zip://test.zip#test.txt');
echo $result;