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<?php
/**
* File containing the ezcBaseFeatures class.
*
* @package Base
* @version 1.8
* @copyright Copyright (C) 2005-2009 eZ Systems AS. All rights reserved.
* @license http://ez.no/licenses/new_bsd New BSD License
*/
/**
* Provides methods needed to check for features.
*
* Example:
* <code>
* <?php
* echo "supports uid: " . ezcBaseFeatures::supportsUserId() . "\n";
* echo "supports symlink: " . ezcBaseFeatures::supportsSymLink() . "\n";
* echo "supports hardlink: " . ezcBaseFeatures::supportsLink() . "\n";
* echo "has imagemagick identify: " . ezcBaseFeatures::hasImageIdentify() . "\n";
* echo " identify path: " . ezcBaseFeatures::getImageIdentifyExecutable() . "\n";
* echo "has imagemagick convert: " . ezcBaseFeatures::hasImageConvert() . "\n";
* echo " convert path: " . ezcBaseFeatures::getImageConvertExecutable() . "\n";
* echo "has gzip extension: " . ezcBaseFeatures::hasExtensionSupport( 'zlib' ) . "\n";
* echo "has pdo_mysql 1.0.2: " . ezcBaseFeatures::hasExtensionSupport( 'pdo_mysql', '1.0.2' ) . "\n"
* ?>
* </code>
*
* @package Base
* @version 1.8
*/
class ezcBaseFeatures
{
/**
* Used to store the path of the ImageMagick convert utility.
*
* It is initialized in the {@link getImageConvertExecutable()} function.
*
* @var string
*/
private static $imageConvert = null;
/**
* Used to store the path of the ImageMagick identify utility.
*
* It is initialized in the {@link getImageIdentifyExecutable()} function.
*
* @var string
*/
private static $imageIdentify = null;
/**
* Used to store the operating system.
*
* It is initialized in the {@link os()} function.
*
* @var string
*/
private static $os = null;
/**
* Determines if hardlinks are supported.
*
* @return bool
*/
public static function supportsLink()
{
return function_exists( 'link' );
}
/**
* Determines if symlinks are supported.
*
* @return bool
*/
public static function supportsSymLink()
{
return function_exists( 'symlink' );
}
/**
* Determines if posix uids are supported.
*
* @return bool
*/
public static function supportsUserId()
{
return function_exists( 'posix_getpwuid' );
}
/**
* Determines if the ImageMagick convert utility is installed.
*
* @return bool
*/
public static function hasImageConvert()
{
return !is_null( self::getImageConvertExecutable() );
}
/**
* Returns the path to the ImageMagick convert utility.
*
* On Linux, Unix,... it will return something like: /usr/bin/convert
* On Windows it will return something like: C:\Windows\System32\convert.exe
*
* @return string
*/
public static function getImageConvertExecutable()
{
if ( !is_null( self::$imageConvert ) )
{
return self::$imageConvert;
}
return ( self::$imageConvert = self::findExecutableInPath( 'convert' ) );
}
/**
* Determines if the ImageMagick identify utility is installed.
*
* @return bool
*/
public static function hasImageIdentify()
{
return !is_null( self::getImageIdentifyExecutable() );
}
/**
* Returns the path to the ImageMagick identify utility.
*
* On Linux, Unix,... it will return something like: /usr/bin/identify
* On Windows it will return something like: C:\Windows\System32\identify.exe
*
* @return string
*/
public static function getImageIdentifyExecutable()
{
if ( !is_null( self::$imageIdentify ) )
{
return self::$imageIdentify;
}
return ( self::$imageIdentify = self::findExecutableInPath( 'identify' ) );
}
/**
* Determines if the specified extension is loaded.
*
* If $version is specified, the specified extension will be tested also
* against the version of the loaded extension.
*
* Examples:
* <code>
* hasExtensionSupport( 'gzip' );
* </code>
* will return true if gzip extension is loaded.
*
* <code>
* hasExtensionSupport( 'pdo_mysql', '1.0.2' );
* </code>
* will return true if pdo_mysql extension is loaded and its version is at least 1.0.2.
*
* @param string $extension
* @param string $version
* @return bool
*/
public static function hasExtensionSupport( $extension, $version = null )
{
if ( is_null( $version ) )
{
return extension_loaded( $extension );
}
return extension_loaded( $extension ) && version_compare( phpversion( $extension ), $version, ">=" ) ;
}
/**
* Determines if the specified function is available.
*
* Examples:
* <code>
* ezcBaseFeatures::hasFunction( 'imagepstext' );
* </code>
* will return true if support for Type 1 fonts is available with your GD
* extension.
*
* @param string $functionName
* @return bool
*/
public static function hasFunction( $functionName )
{
return function_exists( $functionName );
}
/**
* Returns if a given class exists.
* Checks for a given class name and returns if this class exists or not.
* Catches the ezcBaseAutoloadException and returns false, if it was thrown.
*
* @param string $className The class to check for.
* @param bool $autoload True to use __autoload(), otherwise false.
* @return bool True if the class exists. Otherwise false.
*/
public static function classExists( $className, $autoload = true )
{
try
{
if ( class_exists( $className, $autoload ) )
{
return true;
}
return false;
}
catch ( ezcBaseAutoloadException $e )
{
return false;
}
}
/**
* Returns the operating system on which PHP is running.
*
* This method returns a sanitized form of the OS name, example
* return values are "Windows", "Mac", "Linux" and "FreeBSD". In
* all other cases it returns the value of the internal PHP constant
* PHP_OS.
*
* @return string
*/
public static function os()
{
if ( is_null( self::$os ) )
{
$uname = php_uname( 's' );
if ( substr( $uname, 0, 7 ) == 'Windows' )
{
self::$os = 'Windows';
}
elseif ( substr( $uname, 0, 3 ) == 'Mac' )
{
self::$os = 'Mac';
}
elseif ( strtolower( $uname ) == 'linux' )
{
self::$os = 'Linux';
}
elseif ( strtolower( substr( $uname, 0, 7 ) ) == 'freebsd' )
{
self::$os = 'FreeBSD';
}
else
{
self::$os = PHP_OS;
}
}
return self::$os;
}
/**
* Returns the path of the specified executable, if it can be found in the system's path.
*
* It scans the PATH enviroment variable based on the OS to find the
* $fileName. For Windows, the path is with \, not /. If $fileName is not
* found, it returns null.
*
* @todo consider using getenv( 'PATH' ) instead of $_ENV['PATH']
* (but that won't work under IIS)
*
* @param string $fileName
* @return string
*/
public static function findExecutableInPath( $fileName )
{
if ( array_key_exists( 'PATH', $_ENV ) )
{
$envPath = trim( $_ENV['PATH'] );
}
else if ( ( $envPath = getenv( 'PATH' ) ) !== false )
{
$envPath = trim( $envPath );
}
if ( is_string( $envPath ) && strlen( trim( $envPath ) ) == 0 )
{
$envPath = false;
}
switch ( self::os() )
{
case 'Unix':
case 'FreeBSD':
case 'Mac':
case 'MacOS':
case 'Darwin':
case 'Linux':
case 'SunOS':
if ( $envPath )
{
$dirs = explode( ':', $envPath );
foreach ( $dirs as $dir )
{
// The @-operator is used here mainly to avoid
// open_basedir warnings. If open_basedir (or any other
// circumstance) prevents the desired file from being
// accessed, it is fine for file_exists() to return
// false, since it is useless for use then, anyway.
if ( file_exists( "{$dir}/{$fileName}" ) )
{
return "{$dir}/{$fileName}";
}
}
}
// The @-operator is used here mainly to avoid open_basedir
// warnings. If open_basedir (or any other circumstance)
// prevents the desired file from being accessed, it is fine
// for file_exists() to return false, since it is useless for
// use then, anyway.
elseif ( @file_exists( "./{$fileName}" ) )
{
return $fileName;
}
break;
case 'Windows':
if ( $envPath )
{
$dirs = explode( ';', $envPath );
foreach ( $dirs as $dir )
{
// The @-operator is used here mainly to avoid
// open_basedir warnings. If open_basedir (or any other
// circumstance) prevents the desired file from being
// accessed, it is fine for file_exists() to return
// false, since it is useless for use then, anyway.
if ( @file_exists( "{$dir}\\{$fileName}.exe" ) )
{
return "{$dir}\\{$fileName}.exe";
}
}
}
// The @-operator is used here mainly to avoid open_basedir
// warnings. If open_basedir (or any other circumstance)
// prevents the desired file from being accessed, it is fine
// for file_exists() to return false, since it is useless for
// use then, anyway.
elseif ( @file_exists( "{$fileName}.exe" ) )
{
return "{$fileName}.exe";
}
break;
}
return null;
}
/**
* Reset the cached information.
*
* @return void
* @access private
* @ignore
*/
public static function reset()
{
self::$imageIdentify = null;
self::$imageConvert = null;
self::$os = null;
}
}
?>
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