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# bzcompress

(PHP 4 >= 4.3.3, PHP 5)

bzcompress -- Compress a string into bzip2 encoded data

## 说明

mixed bzcompress ( string source [, int blocksize [, int workfactor]] )

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. blocksize defaults to 4.

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 and 30 being the default value.

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

## 返回值

The compressed string or number of error in case of error.

## 范例

例子 1. Compressing data

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

## 参见

bzdecompress()

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