bzcompress
(PHP 4 >= 4.0.4, PHP 5)
bzcompress — Compress a string into bzip2 encoded data
说明
mixed bzcompress ( string $source [, int $blocksize = 4 [, int $workfactor = 0 ]] )bzcompress() compresses the given string and returns it as bzip2 encoded data.
参数
- source
-
The string to compress.
- blocksize
-
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.
- workfactor
-
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 workfactor, the generated output is the same.
返回值
The compressed string, or an error number if an error occurred.
范例
Example #1 Compressing data
<?php
$str = "sample data";
$bzstr = bzcompress($str, 9);
echo $bzstr;
?>
参见
- bzdecompress() - Decompresses bzip2 encoded data
