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<?php
/*****************************************************************************
*
* oldPhpVersionFixes.php - This implements some functions which are present
* in newer PHP versions but are already needed by
* NagVis PHP code
*
* Copyright (c) 2004-2016 NagVis Project (Contact: info@nagvis.org)
*
* License:
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*****************************************************************************/
/**
* @author Lars Michelsen <lm@larsmichelsen.com>
*/
/**
* This implements the function date_default_timezone_set() which is needed
* since PHP 5.1 by all PHP date functions
*
* @author Lars Michelsen <lm@larsmichelsen.com>
*/
if(!function_exists('date_default_timezone_set')) {
function date_default_timezone_set($timezone_identifier) {
putenv("TZ=".$timezone_identifier);
return TRUE;
}
}
// To prevent the annoying and in most cases useless message:
//
// Error: (0) date() [function.date]: It is not safe to rely on the system's
// timezone settings. You are *required* to use the date.timezone setting or
// the date_default_timezone_set() function. In case you used any of those
// methods and you are still getting this warning, you most likely misspelled
// the timezone identifier. We selected 'Europe/Berlin' for 'CEST/2.0/DST' instead
//
// Workaround the problem by setting the systems timezone as PHP default
// timezone. Don't let PHP know about that hack - it would cry again ;-).
if(function_exists("date_default_timezone_get"))
date_default_timezone_set(@date_default_timezone_get());
// PHP 8.2 deprecates utf8_encode. To stay compatible with older installations
// and installations not providing the mbstring extension, we implement an approach
// which defaults to mbstring and falls back to a polyfill.
function iso8859_1_to_utf8($s) {
if (function_exists("mb_convert_encoding")) {
return mb_convert_encoding($s, 'UTF-8', 'ISO-8859-1');
}
$s .= $s;
$len = \strlen($s);
for ($i = $len >> 1, $j = 0; $i < $len; ++$i, ++$j) {
switch (true) {
case $s[$i] < "\x80": $s[$j] = $s[$i]; break;
case $s[$i] < "\xC0": $s[$j] = "\xC2"; $s[++$j] = $s[$i]; break;
default: $s[$j] = "\xC3"; $s[++$j] = \chr(\ord($s[$i]) - 64); break;
}
}
return substr($s, 0, $j);
}
// This implements the function hash_equals which is needed for timing safe hash comparisons but
// only available from PHP 5.6.0 on.
if(!function_exists('hash_equals')) {
function hash_equals($str1, $str2)
{
if(strlen($str1) !== strlen($str2))
return false;
$xor_result = $str1 ^ $str2;
$diff = 0;
for($i = 0; $i < strlen($xor_result); $i++)
{
$diff |= ord($xor_result[$i]);
}
return $diff === 0;
}
}
?>
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