Wordpress get replies and child replies for a comment

getReplies.php

function getReplies($comment_post_id, $commentID){
	$wp_comments = $this->wpdb->prefix . "comments";
	$childData = array();
		
	$data = $this->wpdb->get_results( "SELECT * FROM $wp_comments 
		WHERE $wp_comments.comment_post_ID = $comment_post_id AND $wp_comments.comment_parent != 0");
	
	$dataLength = count($data);
		
	for($i = 0; $i< $dataLength; $i++){
		if($data[$i]->comment_parent == $commentID) {
			array_push($childData, $data[$i]);
			}
		}	
		
	for($t = 0; $t<count($data); $t++){
		for($r = 0; $r<count($childData); $r++){
			if($data[$t]->comment_parent == $childData[$r]->comment_ID){
				array_push($childData, $data[$t]);
			}
		}
	}
			
	return $childData;

	}