PHP多语言翻译 和php的gettext函数类似

<?php /** * PHP-Gettext External Library: gettext_reader class * * @package External * @subpackage PHP-gettext * * @internal Copyright (c) 2003 Danilo Segan <danilo@kvota.net>. Copyright (c) 2005 Nico Kaiser <nico@siriux.net> This file is part of PHP-gettext. PHP-gettext is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. PHP-gettext 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 PHP-gettext; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /** * Provides a simple gettext replacement that works independently from * the system's gettext abilities. * It can read MO files and use them for translating strings. * The files are passed to gettext_reader as a Stream (see streams.php) * * This version has the ability to cache all strings and translations to * speed up the string lookup. * While the cache is enabled by default, it can be switched off with the * second parameter in the constructor (e.g. whenusing very large MO files * that you don't want to keep in memory) */ class gettext_reader { //public: var $error = 0; // public variable that holds error code (0 if no error) //private: var $BYTEORDER = 0; // 0: low endian, 1: big endian var $STREAM = NULL; var $short_circuit = false; var $enable_cache = false; var $originals = NULL; // offset of original table var $translations = NULL; // offset of translation table var $pluralheader = NULL; // cache header field for plural forms var $select_string_function = NULL; // cache function, which chooses plural forms var $total = 0; // total string count var $table_originals = NULL; // table for original strings (offsets) var $table_translations = NULL; // table for translated strings (offsets) var $cache_translations = NULL; // original -> translation mapping /* Methods */ /** * Reads a 32bit Integer from the Stream * * @access private * @return Integer from the Stream */ function readint() { if ($this->BYTEORDER == 0) { // low endian $low_end = unpack('V', $this->STREAM->read(4)); return array_shift($low_end); } else { // big endian $big_end = unpack('N', $this->STREAM->read(4)); return array_shift($big_end); } } /** * Reads an array of Integers from the Stream * * @param int count How many elements should be read * @return Array of Integers */ function readintarray($count) { if ($this->BYTEORDER == 0) { // low endian return unpack('V'.$count, $this->STREAM->read(4 * $count)); } else { // big endian return unpack('N'.$count, $this->STREAM->read(4 * $count)); } } /** * Constructor * * @param object Reader the StreamReader object * @param boolean enable_cache Enable or disable caching of strings (default on) */ function gettext_reader($Reader, $enable_cache = true) { // If there isn't a StreamReader, turn on short circuit mode. if (! $Reader || isset($Reader->error) ) { $this->short_circuit = true; return; } // Caching can be turned off $this->enable_cache = $enable_cache; // $MAGIC1 = (int)0x950412de; //bug in PHP 5.0.2, see https://savannah.nongnu.org/bugs/?func=detailitem&item_id=10565 $MAGIC1 = (int) - 1794895138; // $MAGIC2 = (int)0xde120495; //bug $MAGIC2 = (int) - 569244523; // 64-bit fix $MAGIC3 = (int) 2500072158; $this->STREAM = $Reader; $magic = $this->readint(); if ($magic == $MAGIC1 || $magic == $MAGIC3) { // to make sure it works for 64-bit platforms $this->BYTEORDER = 0; } elseif ($magic == ($MAGIC2 & 0xFFFFFFFF)) { $this->BYTEORDER = 1; } else { $this->error = 1; // not MO file return false; } // FIXME: Do we care about revision? We should. $revision = $this->readint(); $this->total = $this->readint(); $this->originals = $this->readint(); $this->translations = $this->readint(); } /** * Loads the translation tables from the MO file into the cache * If caching is enabled, also loads all strings into a cache * to speed up translation lookups * * @access private */ function load_tables() { if (is_array($this->cache_translations) && is_array($this->table_originals) && is_array($this->table_translations)) return; /* get original and translations tables */ $this->STREAM->seekto($this->originals); $this->table_originals = $this->readintarray($this->total * 2); $this->STREAM->seekto($this->translations); $this->table_translations = $this->readintarray($this->total * 2); if ($this->enable_cache) { $this->cache_translations = array (); /* read all strings in the cache */ for ($i = 0; $i < $this->total; $i++) { $this->STREAM->seekto($this->table_originals[$i * 2 + 2]); $original = $this->STREAM->read($this->table_originals[$i * 2 + 1]); $this->STREAM->seekto($this->table_translations[$i * 2 + 2]); $translation = $this->STREAM->read($this->table_translations[$i * 2 + 1]); $this->cache_translations[$original] = $translation; } } } /** * Returns a string from the "originals" table * * @access private * @param int num Offset number of original string * @return string Requested string if found, otherwise '' */ function get_original_string($num) { $length = $this->table_originals[$num * 2 + 1]; $offset = $this->table_originals[$num * 2 + 2]; if (! $length) return ''; $this->STREAM->seekto($offset); $data = $this->STREAM->read($length); return (string)$data; } /** * Returns a string from the "translations" table * * @access private * @param int num Offset number of original string * @return string Requested string if found, otherwise '' */ function get_translation_string($num) { $length = $this->table_translations[$num * 2 + 1]; $offset = $this->table_translations[$num * 2 + 2]; if (! $length) return ''; $this->STREAM->seekto($offset); $data = $this->STREAM->read($length); return (string)$data; } /** * Binary search for string * * @access private * @param string string * @param int start (internally used in recursive function) * @param int end (internally used in recursive function) * @return int string number (offset in originals table) */ function find_string($string, $start = -1, $end = -1) { if (($start == -1) or ($end == -1)) { // find_string is called with only one parameter, set start end end $start = 0; $end = $this->total; } if (abs($start - $end) <= 1) { // We're done, now we either found the string, or it doesn't exist $txt = $this->get_original_string($start); if ($string == $txt) return $start; else return -1; } else if ($start > $end) { // start > end -> turn around and start over return $this->find_string($string, $end, $start); } else { // Divide table in two parts $half = (int)(($start + $end) / 2); $cmp = strcmp($string, $this->get_original_string($half)); if ($cmp == 0) // string is exactly in the middle => return it return $half; else if ($cmp < 0) // The string is in the upper half return $this->find_string($string, $start, $half); else // The string is in the lower half return $this->find_string($string, $half, $end); } } /** * Translates a string * * @access public * @param string string to be translated * @return string translated string (or original, if not found) */ function translate($string) { if ($this->short_circuit) return $string; $this->load_tables(); if ($this->enable_cache) { // Cachi