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