Plain text to paragraph

functions.php

function paragraph_formater($content,$limit)
{
    $content = array_filter(preg_split('/(?<!\.)\.\s*(?!\.)/', $content));
    $out = [];
    $temp = '';
    for ($i = 0; $i < count($content); $i++) {
        $len = mb_strlen($content[$i]);
        if ($temp == '') {
            if ($len > $limit) {
                $out[] = '<p>' . $content[$i] . '.</p>';
            } else {
                $temp .= $content[$i] . '.';
            }
        } else {
            $templen = mb_strlen($temp);
            if (($len + $templen) > $limit) {
                $out[] = '<p>' . $temp  . $content[$i] . '.</p>';
                $temp = '';

            } else {
                $temp .= $content[$i] . '.';
            }
        }

    }
    return implode('',$out);
}