1* Calculate the estimated reading time for a given piece of $content depending on words count.
2*
3* @param string $content Content to calculate read time for.
4* @param int $wpm Estimated words per minute of reader.
5*
6* @returns	int $time Estimated reading time.
7*/
8function site_estimated_reading_time( $content = '', $wpm = 250 ) {
9    $clean_content = strip_shortcodes( $content );
10    $clean_content = strip_tags( $clean_content );
11    $word_count = str_word_count( $clean_content );
12    $time = ceil( $word_count / $wpm );
13    return $time;
14}