9、接下来，将以下 PHP 代码添加到 index.php 中：
<?php
$directory = dirname(__FILE__)."/../index";
if (file_exists($directory) === FALSE) {
mkdir($directory);
}
define("INDEX_DIRECTORY", $directory);
try {
$extension = zget('/request/params/extension');
if (strlen($extension) > 0) {
$directory = zget('/request/params/directory');
if (strlen($directory) > 0) {
index_directory($directory, $extension);
}
}
} catch (JavaException $exception) {
echo "Index creation failed [".
$exception->getMessage()."]</br>";
}
?>
10、尚不要运行，因为还没有完成！代码从全局上下文获取表单变量，并检查是否已经填充。如果已经跳出，则会调用 index_directory 函数。此函数将在后面进行说明，负责将任何匹配的文件添加到 Lucene 搜索引擎。
11、接下来，将以下 PHP 代码添加到 index.php 中：
/**
* This creates an index from scratch and adds all the documents
* by recursing from the directory passed in. It also checks
* each candidate file to see if it matches the file extension.
*/
function index_directory($path, $extension) {
echo "Indexing! [".$path.",".$extension."]</br>";
// Uses the SimpleAnalyzer because we will do a performance comparison
with the PHP
// implementation of Lucene in the Zend Framework and it is the closest match
$analyser = new Java("org.apache.lucene.analysis.SimpleAnalyzer");
$policy = new Java("org.apache.lucene.index.KeepOnlyLastCommitDeletionPolicy");
$file = new Java("java.io.File", INDEX_DIRECTORY, FALSE);
$file_directory = new JavaClass("org.apache.lucene.store.FSDirectory");
$directory = $file_directory->getDirectory($file);
$writer = new Java("org.apache.lucene.index.IndexWriter",
$directory, TRUE, $analyser, TRUE, $policy);
$writer->setUseCompoundFile(FALSE);
// Insert some calls to microtime() for comparison
$start_time = get_microtime();
recursive_index_directory($writer, $path, $extension);
$count = $writer->docCount();
// Lucene only matches the first 10,000 tokens by default
$writer->setMaxFieldLength(1000000);
$end_index_time = get_microtime();
$writer->optimize();
$end_time = get_microtime();
$writer->close();
echo "Finished indexing [".$count." documents]</br>";
$t1 = $end_index_time - $start_time;
$t2 = $end_time - $end_index_time;
echo "Time to index = $t1 </br>";
echo "Time to optimize = $t2 </br>";
}
本文将不会介绍 Java Lucene API 的详细信息。简单来说，此代码用于创建 IndexWriter 对象。这是键索引对象，当脚本在目录中进行递归时，文件添加到其中。请注意，可以根据很多不同的源（例如，RAM 磁盘）进行反向索引。在此示例中，从常规文件系统读取文件，因此将使用 FSDirectory 类。
一旦设置 IndexWriter，脚本将调用 recursive_index_directory 来实际进行索引工作。此函数传递 IndexWriter，即起始目录以及候选文件要匹配的文件扩展名。