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<?php
/**
* Smarty error handler
*
* @package Smarty
* @subpackage PluginsInternal
* @author Uwe Tews
*
* @deprecated
Smarty does no longer use @filemtime()
*/
class Smarty_Internal_ErrorHandler
{
/**
* contains directories outside of SMARTY_DIR that are to be muted by muteExpectedErrors()
*/
public static $mutedDirectories = array();
/**
* error handler returned by set_error_handler() in self::muteExpectedErrors()
*/
private static $previousErrorHandler = null;
/**
* Enable error handler to mute expected messages
*
*/
public static function muteExpectedErrors()
{
/*
error muting is done because some people implemented custom error_handlers using
http://php.net/set_error_handler and for some reason did not understand the following paragraph:
It is important to remember that the standard PHP error handler is completely bypassed for the
error types specified by error_types unless the callback function returns FALSE.
error_reporting() settings will have no effect and your error handler will be called regardless -
however you are still able to read the current value of error_reporting and act appropriately.
Of particular note is that this value will be 0 if the statement that caused the error was
prepended by the @ error-control operator.
Smarty deliberately uses @filemtime() over file_exists() and filemtime() in some places. Reasons include
- @filemtime() is almost twice as fast as using an additional file_exists()
- between file_exists() and filemtime() a possible race condition is opened,
which does not exist using the simple @filemtime() approach.
*/
$error_handler = array('Smarty_Internal_ErrorHandler', 'mutingErrorHandler');
$previous = set_error_handler($error_handler);
// avoid dead loops
if ($previous !== $error_handler) {
self::$previousErrorHandler = $previous;
}
}
/**
* Error Handler to mute expected messages
*
* @link http://php.net/set_error_handler
*
* @param integer $errno Error level
* @param $errstr
* @param $errfile
* @param $errline
* @param $errcontext
*
* @return bool
*/
public static function mutingErrorHandler($errno, $errstr, $errfile, $errline, $errcontext)
{
$_is_muted_directory = false;
// add the SMARTY_DIR to the list of muted directories
if (!isset(self::$mutedDirectories[ SMARTY_DIR ])) {
$smarty_dir = realpath(SMARTY_DIR);
if ($smarty_dir !== false) {
self::$mutedDirectories[ SMARTY_DIR ] =
array('file' => $smarty_dir, 'length' => strlen($smarty_dir),);
}
}
// walk the muted directories and test against $errfile
foreach (self::$mutedDirectories as $key => &$dir) {
if (!$dir) {
// resolve directory and length for speedy comparisons
$file = realpath($key);
if ($file === false) {
// this directory does not exist, remove and skip it
unset(self::$mutedDirectories[ $key ]);
continue;
}
$dir = array('file' => $file, 'length' => strlen($file),);
}
if (!strncmp($errfile, $dir[ 'file' ], $dir[ 'length' ])) {
$_is_muted_directory = true;
break;
}
}
// pass to next error handler if this error did not occur inside SMARTY_DIR
// or the error was within smarty but masked to be ignored
if (!$_is_muted_directory || ($errno && $errno & error_reporting())) {
if (self::$previousErrorHandler) {
return call_user_func(
self::$previousErrorHandler,
$errno,
$errstr,
$errfile,
$errline,
$errcontext
);
} else {
return false;
}
}
}
}
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