<?
/**
* @package Text class
* @uses This class can extract keywords from text file
*/
class Text
{
/**
* Source text
*
* @var String
*/
private $text = '';
/**
* All words
*
* @var Array
*/
private $words = '';
/**
* Preparation
*
* @param $text_file String
* @param $min_strlen Int
*/
public function __construct ($text_file)
{
if (file_exists ($text_file))
{
$this->text = file_get_contents ($text_file);
}
else
{
throw new Exception("File $text_file not found");
}
$this->text2words ();
$this->gen_words ();
}
/**
* Convert text to array of words
*/
private function text2words ()
{
preg_match_all ('/(\w+)/i', $this->text, $this->words);
$this->words = $this->words ['0'];
}
/**
* Returns words from array of words
*
*/
private function gen_words ()
{
$this->words = array_count_values ($this->words);
arsort ($this->words);
}
/**
* Returns elements from $a to $b
*
* @param $a Int
* @param $b Int
* @return Array|false
*/
public function get_limit ($a, $b)
{
if ((int) $b==="0")
{
return false;
}
return array_slice ($this->words, (int) $a, $b);
}
/**
* Returns elements frequency > $a
*
* @param $a Int Frequency
* @return Array
*/
public function get_count_limit ($a)
{
$a = (int) $a;
foreach ($this->words as $key=>$value)
{
if ($value >= $a)
{
$temp[$key] = $value;
}
else
{
break;
}
}
return $temp;
}
/**
* Returns all words
*
* @return Array
*/
public function get_all ()
{
return $this->words;
}
}
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