IT. Expert System.

PHP

Using Phar Archives: Introduction


Using Phar Archives: Introduction

Phar archives are similar in concept to Java JAR archives, but are tailored to the needs and to the flexibility of PHP applications. A Phar archive is used to distribute a complete PHP application or library in a single file. A Phar archive application is used exactly like any other PHP application:

 php coolapplication.phar 

Using a Phar archive library is identical to using any other PHP library:

<?php
include 'coollibrary.phar';
?>

The phar stream wrapper provides the core of the phar extension, and is explained in detail here. The phar stream wrapper allows accessing the files within a phar archive using PHP's standard file functions fopen(), opendir(), and others that work on regular files. The phar stream wrapper supports all read/write operations on both files and directories.

<?php
include 'phar://coollibrary.phar/internal/file.php';
header('Content-type: image/jpeg');
// phars can be accessed by full path or by alias
echo file_get_contents('phar:///fullpath/to/coollibrary.phar/images/wow.jpg');
?>

The Phar class implements advanced functionality for accessing files and for creating phar archives. The Phar class is explained in detail here.

<?php
try {
    
// open an existing phar
    
$p = new Phar('coollibrary.phar'0);
    
// Phar extends SPL's DirectoryIterator class
    
foreach (new RecursiveIteratorIterator($p) as $file) {
        
// $file is a PharFileInfo class, and inherits from SplFileInfo
        
echo $file->getFileName() . "\n";
        echo 
file_get_contents($file->getPathName()) . "\n"// display contents;
    
}
    if (isset(
$p['internal/file.php'])) {
        
var_dump($p['internal/file.php']->getMetadata());
    }

    
// create a new phar - phar.readonly must be 0 in php.ini
    // phar.readonly is enabled by default for security reasons.
    // On production servers, Phars need never be created,
    // only executed.
    
if (Phar::canWrite()) {
        
$p = new Phar('newphar.tar.phar'0'newphar.tar.phar');
        
// make this a tar-based phar archive, compressed with gzip compression (.tar.gz)
        
$p $p->convertToExecutable(Phar::TARPhar::GZ);

        
// create transaction - nothing is written to newphar.phar
        // until stopBuffering() is called, although temporary storage is needed
        
$p->startBuffering();
        
// add all files in /path/to/project, saving in the phar with the prefix "project"
        
$p->buildFromIterator(new RecursiveIteratorIterator(new DirectoryIterator('/path/to/project')), '/path/to/');

        
// add a new file via the array access API
        
$p['file1.txt'] = 'Information';
        
$fp fopen('hugefile.dat''rb');
        
// copy all data from the stream
        
$p['data/hugefile.dat'] = $fp;

        if (
Phar::canCompress(Phar::GZ)) {
            
$p['data/hugefile.dat']->compress(Phar::GZ);
        }

        
$p['images/wow.jpg'] = file_get_contents('images/wow.jpg');
        
// any value can be saved as file-specific meta-data
        
$p['images/wow.jpg']->setMetadata(array('mime-type' => 'image/jpeg'));
        
$p['index.php'] = file_get_contents('index.php');
        
$p->setMetadata(array('bootstrap' => 'index.php'));

        
// save the phar archive to disk
        
$p->stopBuffering();
    }
} catch (
Exception $e) {
    echo 
'Could not open Phar: '$e;
}
?>

In addition, verification of phar file contents can be done using any of the supported symmetric hash algorithms (MD5, SHA1, SHA256 and SHA512 if ext/hash is enabled) and using asymmetric public/private key signing using OpenSSL (new in Phar 2.0.0). To take advantage of OpenSSL signing, you need to generate a public/private key pair, and use the private key to set the signature using Phar::setSignatureAlgorithm(). In addition, the public key as extracted using this code:

<?php
$public 
openssl_get_publickey(file_get_contents('private.pem'));
$pkey '';
openssl_pkey_export($public$pkey);
?>
must be saved adjacent to the phar archive it verifies. If the phar archive is saved as /path/to/my.phar, the public key must be saved as /path/to/my.phar.pubkey, or phar will be unable to verify the OpenSSL signature.

As of version 2.0.0, The Phar class also provides 3 static methods, Phar::webPhar(), Phar::mungServer() and Phar::interceptFileFuncs() that are crucial to packaging up PHP applications designed for usage on regular filesystems and for web-based applications. Phar::webPhar() implements a front controller that routes HTTP calls to the correct location within the phar archive. Phar::mungServer() is used to modify the values of the $_SERVER array to trick applications that process these values. Phar::interceptFileFuncs() instructs Phar to intercept calls to fopen(), file_get_contents(), opendir(), and all of the stat-based functions (file_exists(), is_readable() and so on) and route all relative paths to locations within the phar archive.

As an example, packaging up a release of the popular phpMyAdmin application for use as a phar archive requires only this simple script and then phpMyAdmin.phar.tar.php can be accessed as a regular file from your web server after modifying the user/password:

<?php
@unlink('phpMyAdmin.phar.tar.php');
copy('phpMyAdmin-2.11.3-english.tar.gz''phpMyAdmin.phar.tar.php');
$a = new Phar('phpMyAdmin.phar.tar.php');
$a->startBuffering();
$a["phpMyAdmin-2.11.3-english/config.inc.php"] = '<?php
/* Servers configuration */
$i = 0;

/* Server localhost (config:root) [1] */
$i++;
$cfg[\'Servers\'][$i][\'host\'] = \'localhost\';
$cfg[\'Servers\'][$i][\'extension\'] = \'mysqli\';
$cfg[\'Servers\'][$i][\'connect_type\'] = \'tcp\';
$cfg[\'Servers\'][$i][\'compress\'] = false;
$cfg[\'Servers\'][$i][\'auth_type\'] = \'config\';
$cfg[\'Servers\'][$i][\'user\'] = \'root\';
$cfg[\'Servers\'][$i][\'password\'] = \'\';


/* End of servers configuration */
if (strpos(PHP_OS, \'WIN\') !== false) {
    $cfg[\'UploadDir\'] = getcwd();
} else {
    $cfg[\'UploadDir\'] = \'/tmp/pharphpmyadmin\';
    @mkdir(\'/tmp/pharphpmyadmin\');
    @chmod(\'/tmp/pharphpmyadmin\', 0777);
}'
;
$a->setStub('<?php
Phar::interceptFileFuncs();
Phar::webPhar("phpMyAdmin.phar", "phpMyAdmin-2.11.3-english/index.php");
echo "phpMyAdmin is intended to be executed from a web browser\n";
exit -1;
__HALT_COMPILER();
'
);
$a->stopBuffering();
?>



Content

Android Reference

Java basics

Java Enterprise Edition (EE)

Java Standard Edition (SE)

SQL

HTML

PHP

CSS

Java Script

MYSQL

JQUERY

VBS

REGEX

C

C++

C#

Design patterns

RFC (standard status)

RFC (proposed standard status)

RFC (draft standard status)

RFC (informational status)

RFC (experimental status)

RFC (best current practice status)

RFC (historic status)

RFC (unknown status)

IT dictionary

License.
All information of this service is derived from the free sources and is provided solely in the form of quotations. This service provides information and interfaces solely for the familiarization (not ownership) and under the "as is" condition.
Copyright 2016 © ELTASK.COM. All rights reserved.
Site is optimized for mobile devices.
Downloads: 3725 / . Delta: 0.12977 с