README

这是Topia的Term Extractor的PHP端口，链接：Topia's Term Extractor

它被移植到PHP是为了Five Filters项目。

它还整合了Joseph Turian对Topia的Term Extractor所做的部分修改。

它受GPL 3.0和原始许可证（ZPL 2.1）的约束。

我们还提供使用此包的托管Web服务，该服务可以复制雅虎的Term Extraction API，并为在线网络文章提供术语提取。如果您想将其作为Web服务运行或在网络文章上进行术语提取，请参阅http://fivefilters.org/term-extraction/。

简单示例

<?php
// Text to extract terms from
$text = 'Inevitably, then, corporations do not restrict themselves merely to the arena of economics. Rather, as John Dewey observed, "politics is the shadow cast on society by big business". Over decades, corporations have worked together to ensure that the choices offered by \'representative democracy\' all represent their greed for maximised profits.

This is a sensitive task. We do not live in a totalitarian society - the public potentially has enormous power to interfere. The goal, then, is to persuade the public that corporate-sponsored political choice is meaningful, that it makes a difference. The task of politicians at all points of the supposed \'spectrum\' is to appear passionately principled while participating in what is essentially a charade.';

// TermExtractor PHP class (if not using Composer's autoloader)
require 'term-extractor/TermExtractor.php';

$extractor = new TermExtractor();
$terms = $extractor->extract($text);
// We're outputting results in plain text...
header('Content-Type: text/plain; charset=UTF-8');
// Loop through extracted terms and print each term on a new line
foreach ($terms as $term_info) {
	// index 0: term
	// index 1: number of occurrences in text
	// index 2: word count
	list($term, $occurrence, $word_count) = $term_info;
	echo "$term\n";
}

高级示例

<?php
// Text to extract terms from
$text = 'Inevitably, then, corporations do not restrict themselves merely to the arena of economics. Rather, as John Dewey observed, "politics is the shadow cast on society by big business". Over decades, corporations have worked together to ensure that the choices offered by \'representative democracy\' all represent their greed for maximised profits.

This is a sensitive task. We do not live in a totalitarian society - the public potentially has enormous power to interfere. The goal, then, is to persuade the public that corporate-sponsored political choice is meaningful, that it makes a difference. The task of politicians at all points of the supposed \'spectrum\' is to appear passionately principled while participating in what is essentially a charade.';

// include PHP files (not needed if using Composer's autoloader)
require 'term-extractor/TermExtractor.php';
require 'term-extractor/DefaultFilter.php';


// Filters
// -------
// Permissive - accept everything
//require '../TermExtractor/PermissiveFilter.php';
//$filter = new PermissiveFilter();

// Default - accept terms based on occurrence and word count
// min_occurrence - specify the number of times the term must appear in the original text for it be accepted.
// keep_if_strength - keep a term if the term's word count is equal to or greater than this, regardless of occurrence.
$filter = new DefaultFilter($min_occurrence=2, $keep_if_strength=2);

// Tagger
// ------
// Create Tagger instance.
// English is the only supported language at the moment.
$tagger = new Tagger('english');
// Initialise the Tagger instance.
// Use APC if available to store the dictionary file in memory 
// (otherwise it gets loaded from disk every time the Tagger is initialised).
$tagger->initialize($use_apc=true); 

// Term Extractor
// --------------
// Creater TermExtractor instance
$extractor = new TermExtractor($tagger, $filter);
// Extract terms from the text
$terms = $extractor->extract($text);
// We're outputting results in plain text...
header('Content-Type: text/plain; charset=UTF-8');
// Loop through extracted terms and print each term on a new line
foreach ($terms as $term_info) {
	// index 0: term
	// index 1: number of occurrences in text
	// index 2: word count
	list($term, $occurrence, $word_count) = $term_info;
	echo "$term\n";
	echo "  ->  occurrence: $occurrence, word count: $word_count\n\n";
}