/classes/net/php/pear/PEAR.class.php

<?php
/**
 * PEAR, the PHP Extension and Application Repository
 *
 * PEAR class
 *
 * PHP versions 4 and 5
 *
 * LICENSE: This source file is subject to version 3.0 of the PHP license
 * that is available through the world-wide-web at the following URI:
 * http://www.php.net/license/3_0.txt.  If you did not receive a copy of
 * the PHP License and are unable to obtain it through the web, please
 * send a note to license@php.net so we can mail you a copy immediately.
 *
 * @category   pear
 * @package    PEAR
 * @author     Sterling Hughes <sterling@php.net>
 * @author     Stig Bakken <ssb@php.net>
 * @author     Tomas V.V.Cox <cox@idecnet.com>
 * @author     Greg Beaver <cellog@php.net>
 * @copyright  1997-2008 The PHP Group
 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
 * @version    CVS: $Id: PEAR.php,v 1.104 2008/01/03 20:26:34 cellog Exp $
 * @link       http://pear.php.net/package/PEAR
 * @since      File available since Release 0.1
 */

/**#@+
 * ERROR constants
 */
define('PEAR_ERROR_RETURN',     1);
define('PEAR_ERROR_PRINT',      2);
define('PEAR_ERROR_TRIGGER',    4);
define('PEAR_ERROR_DIE',        8);
define('PEAR_ERROR_CALLBACK',  16);
/**
 * WARNING: obsolete
 * @deprecated
 */
define('PEAR_ERROR_EXCEPTION', 32);
/**#@-*/
define('PEAR_ZE2', (function_exists('version_compare') &&
                    version_compare(zend_version(), "2-dev", "ge")));

if (substr(PHP_OS, 0, 3) == 'WIN') {
    define('OS_WINDOWS', true);
    define('OS_UNIX',    false);
    define('PEAR_OS',    'Windows');
} else {
    define('OS_WINDOWS', false);
    define('OS_UNIX',    true);
    define('PEAR_OS',    'Unix'); // blatant assumption
}

// instant backwards compatibility
if (!defined('PATH_SEPARATOR')) {
    if (OS_WINDOWS) {
        define('PATH_SEPARATOR', ';');
    } else {
        define('PATH_SEPARATOR', ':');
    }
}

$GLOBALS['_PEAR_default_error_mode']     = PEAR_ERROR_RETURN;
$GLOBALS['_PEAR_default_error_options']  = E_USER_NOTICE;
$GLOBALS['_PEAR_shutdown_funcs']         = array();
$GLOBALS['_PEAR_error_handler_stack']    = array();

@ini_set('track_errors', true);

/**
 * Base class for other PEAR classes.  Provides rudimentary
 * emulation of destructors.
 *
 * If you want a destructor in your class, inherit PEAR and make a
 * destructor method called _yourclassname (same name as the
 * constructor, but with a "_" prefix).  Also, in your constructor you
 * have to call the PEAR constructor: $this->PEAR();.
 * The destructor method will be called without parameters.  Note that
 * at in some SAPI implementations (such as Apache), any output during
 * the request shutdown (in which destructors are called) seems to be
 * discarded.  If you need to get any debug information from your
 * destructor, use error_log(), syslog() or something similar.
 *
 * IMPORTANT! To use the emulated destructors you need to create the
 * objects by reference: $obj =& new PEAR_child;
 *
 * @category   pear
 * @package    PEAR
 * @author     Stig Bakken <ssb@php.net>
 * @author     Tomas V.V. Cox <cox@idecnet.com>
 * @author     Greg Beaver <cellog@php.net>
 * @copyright  1997-2006 The PHP Group
 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
 * @version    Release: 1.7.2
 * @link       http://pear.php.net/package/PEAR
 * @see        PEAR_Error
 * @since      Class available since PHP 4.0.2
 * @link        http://pear.php.net/manual/en/core.pear.php#core.pear.pear
 */
class net_php_pear_PEAR
{
    // {{{ properties

    /**
     * Whether to enable internal debug messages.
     *
     * @var     bool
     * @access  private
     */
    var $_debug = false;

    /**
     * Default error mode for this object.
     *
     * @var     int
     * @access  private
     */
    var $_default_error_mode = null;

    /**
     * Default error options used for this object when error mode
     * is PEAR_ERROR_TRIGGER.
     *
     * @var     int
     * @access  private
     */
    var $_default_error_options = null;

    /**
     * Default error handler (callback) for this object, if error mode is
     * PEAR_ERROR_CALLBACK.
     *
     * @var     string
     * @access  private
     */
    var $_default_error_handler = '';

    /**
     * Which class to use for error objects.
     *
     * @var     string
     * @access  private
     */
    var $_error_class = 'PEAR_Error';

    /**
     * An array of expected errors.
     *
     * @var     array
     * @access  private
     */
    var $_expected_errors = array();

    // }}}

    // {{{ constructor

    /**
     * Constructor.  Registers this object in
     * $_PEAR_destructor_object_list for destructor emulation if a
     * destructor object exists.
     *
     * @param string $error_class  (optional) which class to use for
     *        error objects, defaults to PEAR_Error.
     * @access public
     * @return void
     */
    function net_php_pear_PEAR($error_class = null)
    {
        $classname = strtolower(get_class($this));
        if ($this->_debug) {
            print "PEAR constructor called, class=$classname\n";
        }
        if ($error_class !== null) {
            $this->_error_class = $error_class;
        }
        while ($classname && strcasecmp($classname, "pear")) {
            $destructor = "_$classname";
            if (method_exists($this, $destructor)) {
                if (!isset($GLOBALS['_PEAR_SHUTDOWN_REGISTERED'])) {
                    $GLOBALS['_PEAR_SHUTDOWN_REGISTERED'] = true;
                }
                break;
            } else {
                $classname = get_parent_class($classname);
            }
        }
    }

    /**
     * Destructor (the emulated type of...).  Does nothing right now,
     * but is included for forward compatibility, so subclass
     * destructors should always call it.
     *
     * See the note in the class desciption about output from
     * destructors.
     *
     * @access public
     * @return void
     */
    function _PEAR() {
        if ($this->_debug) {
            printf("PEAR destructor called, class=%s\n", strtolower(get_class($this)));
        }
    }

    // }}}
    // {{{ getStaticProperty()

    /**
    * If you have a class that's mostly/entirely static, and you need static
    * properties, you can use this method to simulate them. Eg. in your method(s)
    * do this: $myVar = &PEAR::getStaticProperty('myclass', 'myVar');
    * You MUST use a reference, or they will not persist!
    *
    * @access public
    * @param  string $class  The calling classname, to prevent clashes
    * @param  string $var    The variable to retrieve.
    * @return mixed   A reference to the variable. If not set it will be
    *                 auto initialised to NULL.
    */
    function &getStaticProperty($class, $var)
    {
        static $properties;
        if (!isset($properties[$class])) {
            $properties[$class] = array();
        }
        if (!array_key_exists($var, $properties[$class])) {
            $properties[$class][$var] = null;
        }
        return $properties[$class][$var];
    }


    // }}}
    // {{{ isError()

    /**
     * Tell whether a value is a PEAR error.
     *
     * @param   mixed $data   the value to test
     * @param   int   $code   if $data is an error object, return true
     *                        only if $code is a string and
     *                        $obj->getMessage() == $code or
     *                        $code is an integer and $obj->getCode() == $code
     * @access  public
     * @return  bool    true if parameter is an error
     */
    function isError($data, $code = null)
    {
        if (is_a($data, 'PEAR_Error')) {
            if (is_null($code)) {
                return true;
            } elseif (is_string($code)) {
                return $data->getMessage() == $code;
            } else {
                return $data->getCode() == $code;
            }
        }
        return false;
    }

    /**
     * This method is used to tell which errors you expect to get.
     * Expected errors are always returned with error mode
     * PEAR_ERROR_RETURN.  Expected error codes are stored in a stack,
     * and this method pushes a new element onto it.  The list of
     * expected errors are in effect until they are popped off the
     * stack with the popExpect() method.
     *
     * Note that this method can not be called statically
     *
     * @param mixed $code a single error code or an array of error codes to expect
     *
     * @return int     the new depth of the "expected errors" stack
     * @access public
     */
    function expectError($code = '*')
    {
        if (is_array($code)) {
            array_push($this->_expected_errors, $code);
        } else {
            array_push($this->_expected_errors, array($code));
        }
        return sizeof($this->_expected_errors);
    }

    // }}}
    // {{{ popExpect()

    /**
     * This method pops one element off the expected error codes
     * stack.
     *
     * @return array   the list of error codes that were popped
     */
    function popExpect()
    {
        return array_pop($this->_expected_errors);
    }

    /**
     * This method is a wrapper that returns an instance of the
     * configured error class with this object's default error
     * handling applied.  If the $mode and $options parameters are not
     * specified, the object's defaults are used.
     *
     * @param mixed $message a text error message or a PEAR error object
     *
     * @param int $code      a numeric error code (it is up to your class
     *                  to define these if you want to use codes)
     *
     * @param int $mode      One of PEAR_ERROR_RETURN, PEAR_ERROR_PRINT,
     *                  PEAR_ERROR_TRIGGER, PEAR_ERROR_DIE,
     *                  PEAR_ERROR_CALLBACK, PEAR_ERROR_EXCEPTION.
     *
     * @param mixed $options If $mode is PEAR_ERROR_TRIGGER, this parameter
     *                  specifies the PHP-internal error level (one of
     *                  E_USER_NOTICE, E_USER_WARNING or E_USER_ERROR).
     *                  If $mode is PEAR_ERROR_CALLBACK, this
     *                  parameter specifies the callback function or
     *                  method.  In other error modes this parameter
     *                  is ignored.
     *
     * @param string $userinfo If you need to pass along for example debug
     *                  information, this parameter is meant for that.
     *
     * @param string $error_class The returned error object will be
     *                  instantiated from this class, if specified.
     *
     * @param bool $skipmsg If true, raiseError will only pass error codes,
     *                  the error message parameter will be dropped.
     *
     * @access public
     * @return object   a PEAR error object
     * @see PEAR::setErrorHandling
     * @since PHP 4.0.5
     */
    function &raiseError($message = null,
                         $code = null,
                         $mode = null,
                         $options = null,
                         $userinfo = null,
                         $error_class = null,
                         $skipmsg = false)
    {
        // The error is yet a PEAR error object
        if (is_object($message)) {
            $code        = $message->getCode();
            $userinfo    = $message->getUserInfo();
            $error_class = $message->getType();
            $message->error_message_prefix = '';
            $message     = $message->getMessage();
        }

        if (isset($this) && isset($this->_expected_errors) && sizeof($this->_expected_errors) > 0 && sizeof($exp = end($this->_expected_errors))) {
            if ($exp[0] == "*" ||
                (is_int(reset($exp)) && in_array($code, $exp)) ||
                (is_string(reset($exp)) && in_array($message, $exp))) {
                $mode = PEAR_ERROR_RETURN;
            }
        }
        // No mode given, try global ones
        if ($mode === null) {
            // Class error handler
            if (isset($this) && isset($this->_default_error_mode)) {
                $mode    = $this->_default_error_mode;
                $options = $this->_default_error_options;
            // Global error handler
            } elseif (isset($GLOBALS['_PEAR_default_error_mode'])) {
                $mode    = $GLOBALS['_PEAR_default_error_mode'];
                $options = $GLOBALS['_PEAR_default_error_options'];
            }
        }

        if ($error_class !== null) {
            $ec = $error_class;
        } elseif (isset($this) && isset($this->_error_class)) {
            $ec = $this->_error_class;
        } else {
            $ec = 'PEAR_Error';
        }
        if ($skipmsg) {
            $a = new $ec($code, $mode, $options, $userinfo);
        } else {
            $a = new $ec($message, $code, $mode, $options, $userinfo);
        }
        return $a;
    }

    /**
     * Simpler form of raiseError with fewer options.  In most cases
     * message, code and userinfo are enough.
     *
     * @param string $message
     *
     */
    function &throwError($message = null,
                         $code = null,
                         $userinfo = null)
    {
        if (isset($this) && is_a($this, 'net_php_pear_PEAR')) {
            $a = &$this->raiseError($message, $code, null, null, $userinfo);
            return $a;
        } else {
            $a = &net_php_pear_PEAR::raiseError($message, $code, null, null, $userinfo);
            return $a;
        }
    }


    /**
    * OS independant PHP extension load. Remember to take care
    * on the correct extension name for case sensitive OSes.
    *
    * @param string $ext The extension name
    * @return bool Success or not on the dl() call
    */
    function loadExtension($ext)
    {
        if (!extension_loaded($ext)) {
            // if either returns true dl() will produce a FATAL error, stop that
            if ((ini_get('enable_dl') != 1) || (ini_get('safe_mode') == 1)) {
                return false;
            }
            if (OS_WINDOWS) {
                $suffix = '.dll';
            } elseif (PHP_OS == 'HP-UX') {
                $suffix = '.sl';
            } elseif (PHP_OS == 'AIX') {
                $suffix = '.a';
            } elseif (PHP_OS == 'OSX') {
                $suffix = '.bundle';
            } else {
                $suffix = '.so';
            }
            return @dl('php_'.$ext.$suffix) || @dl($ext.$suffix);
        }
        return true;
    }

    // }}}
}

?>