zlib_encode()

zlib_encode() — Compress data with the specified encoding.

Built-in function of PHP 8.5. The manual lists it as available in PHP 5 >= 5.4.0, PHP 7, PHP 8. This page is the reference card: signature, parameters and return value, plus the changelog and the example the manual provides.

Signature

zlib_encode(string $data, int $encoding, int $level = -1): string|false

Parameters

ParameterTypeWhat it takes
$datastringThe data to compress.
$encodingintThe compression algorithm. Either ZLIB_ENCODING_RAW, ZLIB_ENCODING_DEFLATE or ZLIB_ENCODING_GZIP.
$levelint

Return value

See the PHP manual for the return value.

Example

A runnable snippet:

$str = 'hello world'; $enc = zlib_encode($str, ZLIB_ENCODING_DEFLATE); echo bin2hex($enc);

Output:

789ccb48cdc9c95728cf2fca4901001a0b045d

See also

zlib_decode()

All PHP 8.5 built-in functions

Reference card built from the PHP manual page zlib_encode() (PHP documentation, CC BY 3.0). The page is generated from the manual, so the wording of the parameter and return value text follows php.net.