/**
* 获取最终关键字(返回用 "," 间隔的关键字)
*
* @return string
*/
public function getFinallyKeywords($num = 10)
{
$n = 0;
// 获取索引hash数组
$arr = [];
foreach ($this->finallyResult as $v) {
if ($this->resultType == 2 && ($v['t'] == 3 || $v['t'] == 5)) {
continue;
}
$w = StringTool::encoding($v['w'], $this->targetCharSet);
if ($w == ' ') {
continue;
}
if (isset($arr[$w])) {
$arr[$w]++;
} else {
$arr[$w] = 1;
}
}
arsort($arr);
$finallyString = '';
foreach ($arr as $k => $v) {
//排除长度为1的词
if (strlen($k) == 1) {
continue;
} elseif (strlen($k) == 2 && preg_match('/[^0-9a-zA-Z]/', $k)) {
continue;
} elseif (strlen($k) < 4 && !preg_match('/[a-zA-Z]/', $k)) {
continue;
}
$finallyString .= $finallyString == '' ? $k : ',' . $k;
$n++;
if ($n > $num) {
break;
}
}
return $finallyString;
}
