TeamTNT\TNTSearch\Support\Highlighter::extractRelevant PHP Метод

    public function extractRelevant($words, $fulltext, $rellength = 300, $prevcount = 50, $indicator = '...')
    {
        $words = preg_split('/\\PL+/u', $words, -1, PREG_SPLIT_NO_EMPTY);
        $textlength = strlen($fulltext);
        if ($textlength <= $rellength) {
            return $fulltext;
        }
        $locations = $this->_extractLocations($words, $fulltext);
        $startpos = $this->_determineSnipLocation($locations, $prevcount);
        // if we are going to snip too much...
        if ($textlength - $startpos < $rellength) {
            $startpos = $startpos - ($textlength - $startpos) / 2;
        }
        $reltext = substr($fulltext, $startpos, $rellength);
        // check to ensure we dont snip the last word if thats the match
        if ($startpos + $rellength < $textlength) {
            $reltext = substr($reltext, 0, strrpos($reltext, " ")) . $indicator;
            // remove last word
        }
        // If we trimmed from the front add ...
        if ($startpos != 0) {
            $reltext = $indicator . substr($reltext, strpos($reltext, " ") + 1);
            // remove first word
        }
        return $reltext;
    }

 public function testExtractRelevant()
 {
     $hl = new Highlighter();
     $words = "This is some text";
     $fulltext = "bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla " . "bla bla bla This is a sentence that contains the phrase This is some text and " . "thats it bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla " . "bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla " . "bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla ";
     $res = $hl->extractRelevant($words, $fulltext, 100);
     $this->assertEquals("...bla This is a sentence that contains the phrase This is some text and thats it bla bla bla bla...", $res);
 }