gzdeflate()

gzdeflate() — Deflate a string.

Built-in function of PHP 8.5. The manual lists it as available in PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8. This page is the reference card: signature, parameters and return value, plus the changelog and the example the manual provides.

What it does

This function compresses the given string using the DEFLATE data format.

Signature

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

Parameters

ParameterTypeWhat it takes
$datastringThe data to deflate.
$levelintThe level of compression. Can be given as 0 for no compression up to 9 for maximum compression. If not given, the default compression level will be the default compression level of the zlib library.
$encodingintOne of ZLIB_ENCODING_* constants.

Return value

The deflated string or false if an error occurred.

Example

A runnable snippet:

$compressed = gzdeflate('Compress me', 9); echo $compressed;

See also

gzinflate(), gzcompress(), gzuncompress(), gzencode()

All PHP 8.5 built-in functions

Reference card built from the PHP manual page gzdeflate() (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.