Use PHP to call the Lucene package to implement full-text search

Use PHP to call the Lucene package to implement full-text search_PHP tutorial

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Release： 2016-07-13 17:41:59

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Due to work needs, it is necessary to use PHP to implement full-text retrieval of a large number of websites.
And the most popular search engine library for full-text retrieval is Lucene.
It is a sub-project of Apache Jakarta. It also provides simple and practical APIs.
Using these APIs, you can perform full-text search on any basic text data (including databases).

Because PHP itself supports calling external Java classes, I first wrote a class in Java.
This class implements two methods by calling the Lucene API:

public String createIndex(String indexDir_path,String dataDir_path)
public String searchword(String ss,String index_path)
where createIndex is the index creation method,
passes in two parameters namely indexDir_path(index file directory), dataDir_path (indexed file directory), returns the indexed file list string,
The other is searchword, which retrieves the index through the passed keyword parameter (ss), index_path is the index file directory. Returns all retrieved files.

Here is the source code, it is very simple, you can refer to it: TxtFileIndexer.java

The PHP program calls these two methods to realize the call to Lucene, thereby achieving the purpose of full-text retrieval.
The calling method of PHP is as follows:
First create an instance of the TxtFileIndexer class we wrote,

$tf = new Java(TestLucene.TxtFileIndexer);

Then call the normal PHP class calling method, first create the index:

$data_path = "F:/test/php_lucene/htdocs/data/manual"; //The directory that defines the indexed content
$index_path = "F:/test/php_lucene/htdocs/data/search"; //Define the generated index file storage directory
$s = $tf->createIndex($index_path,$data_path); //Call the Java class method
print $s; //Print the returned result

Try searching again this time:

$index_path = "F:/test/php_lucene/htdocs/data/search"; //Define the generated index file storage directory
$s = $tf->searchword("here is keyword for search" ,$index_path);
print $s;

Also pay attention to the path of the Java class, which can be set in PHP

java_require("F:/test/php_lucene/htdocs/lib/"); //This is an example, my classes and Lucene are both placed in this directory

That’s it, isn’t it?

PHP source code: test.php

Next, let me talk about the environment configuration.
First of all, you need to have Java SDK, which is a must. I am using version 1.4.2, other versions should be fine.
PHP5, I tried PHP4, it should work.

Since the Java extension of PHP5 has not been adjusted, and calling Java in the past has been very inefficient and slow, I used the Php/Java Bridge project.

1. Download JavaBridge
URL: http://sourceforge.net/projects/php-java-bridge/
The current version is
php-java-bridge_3.0.8_j2ee.zip

After unpacking, copy
JavaBridgeWEB-INFcgijava-x86-windows.dll
JavaBridgeWEB-INFlibJavaBridge.jar
to the c:phpext directory, and copy
java-x86-windows.dll Renamed to php_java.dll

2. Modify php.ini (example)
extension=php_java.dll

[Java]
java.class.path = "C:phpextJavaBridge.jar;F:testphp_lucenehtdocs"
java.java_home = "C:j2sdk1.4.2_10"
java.library.path = "c:phpext;F:testphp_lucenehtdocs"

3. Restart Apache.

4. You can find some files for indexing
You can modify the paths of index files and data files in test.php.
Line 37 of TxtFileIndexer.java limits indexing to only files with html suffix, which can be modified if necessary.

According to the current situation (JavaBridge supports Linux and Freebsd), it can be run under
linux or freebsd/apache2/php4/lucene/JavaBridge
environment.