rarファイルを読み取って解凍するためにphp_rar拡張機能をphpにインストールする方法

<?php
$archive_name = &#39;/full/path/to/file.rar&#39;
$entry_name = &#39;path/to/archive/entry.txt&#39;; //notice: no slash at the beginning
$dir_to_extract_to = &#39;/path/to/extract/dir&#39;;
$new_entry_name = &#39;some.txt&#39;;
$rar = rar_open($archive_name) OR die(&#39;failed to open &#39; . $archive_name);
$entry = rar_entry_get($rar, $entry_name) OR die(&#39;failed to find &#39; . $entry_name . &#39; in &#39; . $archive_name);
// this will create all necessary subdirs under $dir_to_extract_to
$entry->extract($dir_to_extract_to);
/* OR */
// this will create only one new file $new_entry_name in $dir_to_extract_to
$entry->extract(&#39;&#39;, $dir_to_extract_to.&#39;/&#39;.$new_entry_name);
// this line is really not necessary
rar_close($rar);
?>