php extension for spam word filter based on Double-Array Trie tree, it can detect if a spam word exists in a text message.
关键词过滤扩展，用于检查一段文本中是否出现敏感词，基于Double-Array Trie 树实现。
trie_filter_search_all，一次返回所有的命中词;修复内存泄露
下面的$LIB_PATH为依赖库安装目录，$INSTALL_PHP_PATH为PHP5安装目录。
$ tar zxvf libdatrie-0.2.4.tar.gz
$ cd libdatrie-0.2.4
$ make clean
$ ./configure --prefix=$LIB_PATH
$ make
$ make install
$ $INSTALL_PHP_PATH/bin/phpize
$ ./configure --with-php-config=$INSTALL_PHP_PATH/bin/php-config --with-trie_filter=$LIB_PATH
$ make
$ make install
然后修改php.ini，增加一行：extension=trie_filter.so，然后重启PHP。
<?php
$arrWord = array('word1', 'word2', 'word3');
$resTrie = trie_filter_new(); //create an empty trie tree
foreach ($arrWord as $k => $v) {
trie_filter_store($resTrie, $v);
}
trie_filter_save($resTrie, __DIR__ . '/blackword.tree');
$resTrie = trie_filter_load(__DIR__ . '/blackword.tree');
$strContent = 'hello word2 word1';
$arrRet = trie_filter_search($resTrie, $strContent);
print_r($arrRet); //Array(0 => 6, 1 => 5)
echo substr($strContent, $arrRet[0], $arrRet[1]); //word2
$arrRet = trie_filter_search_all($resTrie, $strContent);
print_r($arrRet); //Array(0 => Array(0 => 6, 1 => 5), 1 => Array(0 => 12, 1 => 5))
$arrRet = trie_filter_search($resTrie, 'hello word');
print_r($arrRet); //Array()
trie_filter_free($resTrie);
PHP 5.2 or later.
Windows is not support until now.
Apache License 2.0
本项目是在用于检测敏感词的 PHP 扩展的基础上改写的。