


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.

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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