get one hit for one ip address

get one hit for one ip address
function ip_exists($ip){
global $mycon;
$query = "SELECT `ip` FROM `hits_ipaddress`";	select ip row from table
if($query_run = mysqli_query($mycon, $query)){	run this query on that database
$num_rows = mysqli_num_rows($query_run);	count the numbe rof rows in that executiion
//num_rows gives bow many rows or whats the row
if($num_rows == 0){	if there is no rows,w rite as false
return false;
} else {	if there is more than one row, it have to checek the present ip address is match r not , if not match write this address
while($row = mysqli_fetch_array($query_run) ) {	while executes , it will get arrays, it will executes all content in that array, go to every thing checks the below condition
$e_ip = $row['ip'];	we convert to arrrays, fetch that pointed array data or row, assigns to $e_ip
if ($ip == $e_ip){	we got one ip , that ip and user ip is correct returs true
return true;}	false *true *true -- true it will add each boolean to next
	same Ip address, hit and ip is not incrimented
}	if it is different ip addres returns false
}	while executes , it will get arrays, it will executes all content in that array, go to every thing checks the below condition
}}
if (!ip_exists($user_ip))	function executes false, but because of oppsite sigm it becomes true
{	wheenever  it will execute when false is comes , false oppsite true, so executs
update_count();
add_ip($user_ip);	it it equal , it never executs, if it is not equal it update
}
	global
how to write	SELECT FROM
hwo to run query against database	mysqli_query
how to get number of rows	mysqli_num_rows
how to convert to row to array	mysqli_fetch_array(
	$row[