2011-03-18 12:10:42 +01:00
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<?php
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/* -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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# ***** BEGIN LICENSE BLOCK *****
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# This file is part of InDefero, an open source project management application.
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2011-04-02 21:37:07 +02:00
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# Copyright (C) 2008-2011 Céondo Ltd and contributors.
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2011-03-18 12:10:42 +01:00
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#
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# InDefero is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# InDefero is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#
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# ***** END LICENSE BLOCK ***** */
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/**
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* PHP sets the backtrack limit quite low, so some (harder to analyze) regexes may fail
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* unexpectedly on large inputs or weird cornercases (see issue 618). Unfortunately this
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* fix does not always work and the execution time gets bigger the bigger we set the limit,
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* so in case PCRE fails to analyze the input string and preg_replace(_callback) returns NULL,
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* we at least return the input string unaltered.
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*
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* @param $pattern The pattern
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* @param $mixed Callback or replacement string
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* @param $input The input
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* @return The output
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*/
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function IDF_Template_safePregReplace($pattern, $mixed, $input)
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{
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$pcre_backtrack_limit = ini_get('pcre.backtrack_limit');
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ini_set('pcre.backtrack_limit', 10000000);
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if (is_string($mixed) && !function_exists($mixed))
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$output = preg_replace($pattern, $mixed, $input);
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else
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$output = preg_replace_callback($pattern, $mixed, $input);
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if ($output === null)
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$output = $input;
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ini_set('pcre.backtrack_limit', $pcre_backtrack_limit);
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return $output;
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}
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