PHP - Keyword matching in text strings - How to enhance the accuracy of returned keywords?

php

Solution

You may want to look at regular expressions to weed out partial matches:

// create regular expression by using alternation
// of all given words
$re = '/\b(?:' . join('|', array_map(function($keyword) {
    return preg_quote($keyword, '/');
}, array_keys($words))) . ')\b/i';

preg_match_all($re, $text, $matches);
foreach ($matches[0] as $keyword) {
    echo $keyword, " ", $words[$keyword], "\n";
}

The expression uses the `\b` assertion to match word boundaries, i.e. the word must be on its own.

Output

World Cup 4
William Shakespeare 8

Problem

I have a piece of PHP code as follows: ``` $words = array( 'Art' => '1', 'Sport' => '2', 'Big Animals' => '3', 'World Cup' => '4', 'David Fincher' => '5', 'Torrentino' => '6', 'Shakes' => '7', 'William Shakespeare' => '8' ); $text = "I like artists, and I like sports. Can you call the name of a big animal? Brazil World Cup matchers are very good. William Shakespeare is very famous in the world."; $all_keywords = $all_keys = array(); foreach ($words as $word => $key) { if (strpos(strtolower($text), strtolower($word)) !== false) { $all_keywords[] = $word; $all_keys[] = $key; } } echo $keywords_list = implode(',', $all_keywords) ."<br>"; echo $keys_list = implode(',', $all_keys) . "<br>"; ``` The code echos `Art,Sport,World Cup,Shakes,William Shakespeare` and `1,2,4,7,8`; however, the code is very simple and is not accurate enough to echo the right keywords. For example, the code returns `'Shakes' => '7'` because of the `Shakespeare` word in `$text`, but as you can see, "Shakes" can not represent "Shakespeare" as a proper keyword. Basically I want to return `Art,Sport,World Cup,William Shakespeare` and `1,2,4,8` instead of `Art,Sport,World Cup,Shakes,William Shakespeare` and `1,2,4,7,8`. So, could you please help me how to develop a better code to extract the keywords without having similar problems? thanks for your help.

Original source