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bzcompress

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

bzcompress — Compress a string into bzip2 encoded data

Description

bzcompress(string $data, int $block_size = 4, int $work_factor = 0): string|int

bzcompress() compresses the given string and returns it as bzip2 encoded data.

Parameters

data

The string to compress.

block_size

Specifies the blocksize used during compression and should be a number from 1 to 9 with 9 giving the best compression, but using more resources to do so.

work_factor

Controls how the compression phase behaves when presented with worst case, highly repetitive, input data. The value can be between 0 and 250 with 0 being a special case.

Regardless of the work_factor, the generated output is the same.

Return Values

The compressed string, or an error number if an error occurred.

Examples

Example #1 Compressing data

<?php
$str = "sample data";
$bzstr = bzcompress($str, 9);
echo $bzstr;
?>

See Also

© 1997–2025 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.bzcompress.php