(PHP 5 >= 5.4.0, PHP 7)
zlib_encode — Compress data with the specified encoding
zlib_encode ( string $data , int $encoding [, int $level = -1 ] ) : string|false
Compress data with the specified encoding.
This function is currently not documented; only its argument list is available.
data
The data to compress.
encoding
The compression algorithm. Either ZLIB_ENCODING_RAW, ZLIB_ENCODING_DEFLATE or ZLIB_ENCODING_GZIP.
level
Example #1 zlib_encode() example
<?php $str = 'hello world'; $enc = zlib_encode($str, ZLIB_ENCODING_DEFLATE); echo bin2hex($enc); ?>
The above example will output:
789ccb48cdc9c95728cf2fca4901001a0b045d
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https://www.php.net/manual/en/function.zlib-encode.php