(PECL rar >= 0.1)
RarEntry::extract — Extract entry from the archive
$dir
    [, string $filepath = ""
    [, string $password = NULL
    [, bool $extended_data = false
   ]]] )
   RarEntry::extract() extracts the entry's data.
   It will create new file in the specified
   dir with the name identical to the entry's name,
   unless the second argument is specified. See below for more information.
  
dir
       Path to the directory where files should be extracted. This parameter is
       considered if and only if filepath is not. If both
       parameters are empty an extraction to the current directory will be
       attempted.
      
filepath
       Path (relative or absolute) containing the directory and filename of the
       extracted file. This parameter overrides both the parameter
       dir and the original file name.
      
password
       The password used to encrypt this entry. If the entry is not encrypted, this value will not be used and can
       be omitted. If this parameter is omitted and the entry is encrypted, the password given to
       rar_open(), if any, will be used. If a wrong password is given, either explicitly
       or implicitly via rar_open(), CRC checking will fail and this method will fail and return FALSE.
       If no password is given and one is required, this method will fail and return FALSE.
       You can check whether an entry is encrypted with RarEntry::isEncrypted().
      
extended_data
       If TRUE, extended information such as NTFS ACLs and Unix owner information will be set in the extract
       files, as long as it's present in the archive.
     
Prior to version 2.0.0, this function would not handle relative paths correctly. Use realpath() as a workaround.
   Returns TRUE on success or FALSE on failure.
  
| Version | Description | 
|---|---|
| 3.0.0 | extended_datawas added. | 
| 3.0.0 | Support for RAR archives with repeated entry names is no longer defective. | 
Example #1 RarEntry::extract() example
<?php
$rar_file = rar_open('example.rar') or die("Failed to open Rar archive");
$entry = rar_entry_get($rar_file, 'Dir/file.txt') or die("Failed to find such entry");
$entry->extract('/dir/to'); // create /dir/to/Dir/file.txt
$entry->extract(false, '/dir/to/new_name.txt'); // create /dir/to/new_name.txt
?>
Example #2 How to extract all files in archive:
<?php
/* example by Erik Jenssen aka erix */
$filename = "foobar.rar";
$filepath = "/home/foo/bar/";
$rar_file = rar_open($filepath.$filename);
$list = rar_list($rar_file);
foreach($list as $file) {
    $entry = rar_entry_get($rar_file, $file);
    $entry->extract("."); // extract to the current dir
}
rar_close($rar_file);
?>