/**
* Split string
*
* @param string $query
* @param string $prefix
* @param string $base
* @return bool
*/
protected function split($query, $prefix = '', $base = '')
{
$len = $this->text->strlen($query);
if ($len > 20) {
return false;
}
for ($i = $this->text->getGram(); $i <= $len - $this->text->getGram() + 1; $i++) {
$a = $this->text->substr($query, 0, $i);
$b = $this->text->substr($query, $i);
$aa = $this->getBestMatch($a);
$bb = $this->getBestMatch($b);
$key = $a . '|' . $b;
if ($prefix) {
$key = $prefix . '|' . $key;
}
$this->keys[$key] = '';
if ($prefix) {
$this->keys[$key] = $prefix . ' ';
}
$this->keys[$key] .= $aa['keyword'] . ' ' . $bb['keyword'];
$this->diffs[$key] = ($this->damerau->similarity($base, $this->keys[$key]) + $aa['diff'] + $bb['diff']) / 3;
if ($prefix) {
$kwd = $prefix . '|' . $aa['keyword'];
} else {
$kwd = $aa['keyword'];
}
if ($aa['diff'] > 50) {
$this->split($b, $kwd, $query);
}
}
return null;
}
/**
* Split string to words
*
* @param string $string
* @param array &$results
* @param int $increment
* @return void
*/
protected function split($string, &$results, $increment = 1)
{
$string = $this->text->cleanString($string);
$words = $this->text->splitWords($string);
foreach ($words as $word) {
if ($this->text->strlen($word) >= $this->text->getGram() && !is_numeric($word) && $this->text->strlen($word) <= 10) {
$word = $this->text->strtolower($word);
if (!isset($results[$word])) {
$results[$word] = $increment;
} else {
$results[$word] += $increment;
}
}
}
}
