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# VII. Bzip2 Compression Functions

# Introduktion

The bzip2 functions are used to transparently read and write bzip2 (.bz2) compressed files.

# Systemkrav

This module uses the functions of the bzip2 library by Julian Seward. This module requires bzip2/libbzip2 version >= 1.0.x.

# Installation

Bzip2 support in PHP is not enabled by default. You will need to use the --with-bz2[=DIR] configuration option when compiling PHP to enable bzip2 support.

# Runtime Konfiguration

Denne udvidelse har intet konfigurations-direktiv defineret i `php.ini`.

# Ressourcetyper

This extension defines one resource type: a file pointer identifying the bz2-file to work on.

# Foruddefinerede Konstanter

Denne udvidelse har ingen konstanter.

# Eksempler

This example opens a temporary file and writes a test string to it, then prints out the contents of the file.

Eksempel 1. Small bzip2 Example

`<?php
$filename = "/tmp/testfile.bz2";
$str = "This is a test string.\n";
// open file for writing
$bz = bzopen($filename, "w");
// write string to file
bzwrite($bz, $str);
// close file
bzclose($bz);
// open file for reading
$bz = bzopen($filename, "r");
// read 10 characters
echo bzread($bz, 10);
// output until end of the file (or the next 1024 char) and close it.
echo bzread($bz);
bzclose($bz);
?>`

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