(PHP 4 >= 4.3.2, PHP 5, PHP 7)
zlib_get_coding_type — Returns the coding type used for output compression
zlib_get_coding_type ( ) : string|false
Returns the coding type used for output compression.
Possible return values are gzip, deflate, or false.
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https://www.php.net/manual/en/function.zlib-get-coding-type.php