(PHP 5 >= 5.4.0, PHP 7)
gzdecode — Decodes a gzip compressed string
gzdecode ( string $data [, int $max_length = 0 ] ) : string|false
 This function returns a decoded version of the input data. 
data
The data to decode, encoded by gzencode().
max_length
The maximum length of data to decode.
 The decoded string, or false if an error occurred. 
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    https://www.php.net/manual/en/function.gzdecode.php