范例

See also the examples under rar:// wrapper.

Example #1 On-the-fly decompression

  <?php

 if (! array_key_exists ( "i" ,  $_GET ) || ! is_numeric ( $_GET [ "i" ]))
    die( "Index unspecified or non-numeric" );
 $index  = (int)  $_GET [ "i" ];
    
 $arch  =  RarArchive :: open ( "example.rar" );
if ( $arch  ===  FALSE )
    die( "Cannot open example.rar" );

 $entries  =  $arch -> getEntries ();
if ( $entries  ===  FALSE )
    die( "Cannot retrieve entries" );

if (! array_key_exists ( $index ,  $entries ))
    die( "No such index:  $index " );

 $orfilename  =  $entries [ $index ]-> getName ();  //UTF-8 encoded

 $filesize  =  $entries [ $index ]-> getUnpackedSize ();

 

 $fp  =  $entries [ $index ]-> getStream ();
if ( $fp  ===  FALSE )
    die( "Cannot open file with index  $index  insided the archive." );

 $arch -> close ();  //no longer needed; stream is independent

 function  detectUserAgent () {
    if (! array_key_exists ( 'HTTP_USER_AGENT' ,  $_SERVER ))
        return  "Other" ;
    
     $uas  =  $_SERVER [ 'HTTP_USER_AGENT' ];
    if ( preg_match ( "@Opera/@" ,  $uas ))
        return  "Opera" ;
    if ( preg_match ( "@Firefox/@" ,  $uas ))
        return  "Firefox" ;
    if ( preg_match ( "@Chrome/@" ,  $uas ))
        return  "Chrome" ;
    if ( preg_match ( "@MSIE ([0-9.]+);@" ,  $uas ,  $matches )) {
        if (((float) $matches [ 1 ]) >=  7.0 )
            return  "IE" ;
    }
    
    return  "Other" ;
}

 
 $formatRFC2231  =  'Content-Disposition: attachment; filename*=UTF-8\'\'%s' ;
 $formatDef  =  'Content-Disposition: attachment; filename="%s"' ;

switch ( detectUserAgent ()) {
    case  "Opera" :
    case  "Firefox" :
         $orfilename  =  rawurlencode ( $orfilename );
         $format  =  $formatRFC2231 ;
        break;

    case  "IE" :
    case  "Chrome" :
         $orfilename  =  rawurlencode ( $orfilename );
         $format  =  $formatDef ;
        break;
    default:
        if ( function_exists ( 'iconv' ))
             $orfilename  =
                @ iconv ( "UTF-8" ,  "ISO-8859-1//TRANSLIT" ,  $orfilename );
         $format  =  $formatDef ;
}

 header ( sprintf ( $format ,  $orfilename ));
 //cannot send error messages from now on (headers already sent)

//replace by real content type, perhaps infering from the file extension
 $contentType  =  "application/octet-stream" ;
 header ( "Content-Type:  $contentType " );

 header ( "Content-Transfer-Encoding: binary" );

 header ( "Content-Length:  $filesize " );

if ( $_SERVER [ 'REQUEST_METHOD' ] ==  "HEAD" )
    die();
    
while (! feof ( $fp )) {
     $s  = @ fread ( $fp ,  8192 );
    if ( $s  ===  false )
        break;  //useless to send error messages
  
     echo  $s ;
}
 ?>

This example opens a RAR file and presents the requested file inside the RAR archive for download to the client.

Example #2 RAR extension filesystem extraction example

  <?php

$rar_file  =  rar_open ( 'example.rar' ) or die( "Can't open Rar archive" );

 $entries  =  rar_list ( $rar_file );

foreach ( $entries  as  $entry ) {
    echo  'Filename: '  .  $entry -> getName () .  "\n" ;
    echo  'Packed size: '  .  $entry -> getPackedSize () .  "\n" ;
    echo  'Unpacked size: '  .  $entry -> getUnpackedSize () .  "\n" ;

     $entry -> extract ( '/dir/extract/to/' );
}

 rar_close ( $rar_file );

 ?>

This example opens a RAR file archive and extracts each entry to the specified directory.

用户评论:

[#1] Nitrogen [2010-11-17 08:43:22]

A veeery simple function to RAR files, I'm not proud of it.
Since there's no way to create RAR files in PHP (due to licensing, patents or whatever), I'm taking some advantage from the command-line RARing tool that comes with WinRAR (in the WinRAR program files named "rar.exe").

<?php function RARFiles($Output='output.rar',$Files=array()) { $Data=''; for($i=0;$i<count($Files);$i++) $Data.="\"{$Files[$i]}\" "; exec("rar.exe a \"{$Output}\" {$Data}"); } $Files=array('file1.ext','file2.ext','file3.ext'); RARFiles('asdf.rar',$Files); // asdf.rar created. ?>

There's no error checking, so make sure you check that your expected RAR file exists before doing anything with it.
Hopefully one day, PHP will be able to be allowed to create RAR files.