(PHP 4 >= 4.0.4, PHP 5, PHP 7)
bzcompress — Compress a string into bzip2 encoded data
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.
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.
The compressed string, or an error number if an error occurred.
Example #1 Compressing data
<?php $str = "sample data"; $bzstr = bzcompress($str, 9); echo $bzstr; ?>
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https://www.php.net/manual/en/function.bzcompress.php