[PHP+MySQL game server player database]

Hello. I just inherited a game stats system but it's not working properly. I'm gonna post the entire script:

<?php
error_reporting(E_ERROR | E_WARNING | E_PARSE);
$servername = "127.0.0.1";
$username = "";
$password = "";
$dbname = "";
 
$addresses = Array();
$nicknames = Array();
$servers = Array();
$times = Array();
 
$find_ip = $_GET["ip"];
$find_name = $_GET["nick"];
 
if(isset($_GET["format"]))
{
	$format = $_GET["format"];
}
else
{
	$format = "include";
}
 
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error)
{
    ReturnError("NO_CONNECTION");
}
 
function ReturnError($error)
{
	global $format;
	if($format == "mod")
		die("!DATA!ERROR:" .$error. "!DATA!");
	else
		die("ERROR:" . $error);
 
}
 
function ReturnData($data)
{
	global $format;
	if($format == "mod")
		die("!DATA!SUCCESS:" .$data. "!DATA!");
	else
 
		die("SUCCESS:" .$data);
}
 
function GetServerIP()
{
	if (!empty($_SERVER['HTTP_CLIENT_IP']))
		return $_SERVER['HTTP_CLIENT_IP'];
	else if (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
		return $_SERVER['HTTP_X_FORWARDED_FOR'];
	else
		return $_SERVER['REMOTE_ADDR'];
}
 
function GetTimestamp()
{
	$now = DateTime::createFromFormat('U.u', number_format(microtime(true), 6, '.', ''));
	$now->format("m-d-Y H:i:s.u");
	$local = $now->setTimeZone(new DateTimeZone('Europe/Prague'));
	return $local->getTimestamp();
}
 
function GetFormatedTime()
{
	$now = DateTime::createFromFormat('U.u', number_format(microtime(true), 6, '.', ''));
	$now->format("m-d-Y H:i:s.u");
	$local = $now->setTimeZone(new DateTimeZone('Europe/Prague'));
	return $local->format("Y-m-d H:i:s.u");
}
 
function AddAddress($addr)
{
	global $addresses;
	if(in_array($addr, $addresses, true))
	{
		return false;
	}
	else
	{
		array_push($addresses, $addr);
		return true;
	}
}
 
function AddTime($time)
{
	global $times;
	if(in_array($time, $times, true))
	{
		return false;
	}
	else
	{
		array_push($times, $time);
		return true;
	}
}
 
function AddNickname($nick)
{
	global $nicknames;
	if(in_array($nick, $nicknames, true))
	{
		return false;
	}
	else
	{
		array_push($nicknames, $nick, true);
		return true;
	}
}
 
function AddServer($server)
{
	global $servers;
	if(in_array($server, $servers, true))
	{
		return false;
	}
	else
	{
		array_push($servers, $server, true);
		return true;
	}
}
 
function LookForIPs($ip)
{
	global $conn;
 
	$sql = "SELECT * FROM  `connections` WHERE `IP` = '".$ip."'";
	$result = $conn->query($sql);
 
	if ($result->num_rows > 0)
	{
		while($row = $result->fetch_assoc())
		{
			AddAddress($row["IP"]);
			AddServer($row["serverIP"]);
			AddTime(Array($row["datestamp"], $row["datestring"], $row["serverIP"]));
 
			if(AddNickname($row["nickname"]) && $row["nickname"] != "Player" && $row["nickname"] != "A_Edition_V2")
			{
				LookForNicknames($row["nickname"]);
			}
 
		}
		return true;
	}
	else
	{
		return false;
	}
}
 
function LookForNicknames($nick)
{
	global $conn;
 
	$sql = "SELECT * FROM  `connections` WHERE `nickname` LIKE '".$nick."'";
	$result = $conn->query($sql);
 
	if ($result->num_rows > 0)
	{
		while($row = $result->fetch_assoc())
		{
			AddNickname($row["nickname"]);
			AddServer($row["serverIP"]);
			AddTime(Array($row["datestamp"], $row["datestring"], $row["serverIP"]));
 
			if(AddAddress($row["IP"]))
			{
				LookForIPs($row["IP"]);
			}
		}
		return true;
	}
	else
	{
		return false;
	}
}
 
function SortTimes()
{
	global $times;
	$good = false;
 
	while($good == false)
	{
		$good = true;
		for($i = 0; $i < count($times); $i++)
		{
			if($i+1 == count($times))
				continue;
 
			if($times[$i][0] < $times[$i + 1][0])
			{
				$tmp = $times[$i];
				$times[$i] = $times[$i + 1];
				$times[$i+1] = $tmp;
 
				$good = false;
			}
		}
	}
}
 
function GenerateLastSeenString($fromTime)
{
	$time_now = GetTimestamp();
 
	if($time_now < $fromTime)
	{
		return "N/A";
	}
	if($fromTime == 0 || $fromTime =="")
	{
		return "N/A";
	}
 
	$ss = $time_now - $fromTime;
 
	$seconds = $ss%60;
	$minutes = floor(($ss%3600)/60);
	$hours = floor(($ss%86400)/3600);
	$days = floor(($ss%2592000)/86400);
	$months = floor($ss/2592000);
 
	$str = "";
 
	if($months != 0)
	{
		if($str != "")
			$str = $str . " ";
		if($days == 1)
			$str = $str . $months . " month";
		else
			$str = $str . $months . " months";
	}
 
	if($days != 0)
	{
		if($str != "")
			$str = $str . " ";
		if($days == 1)
			$str = $str . $days . " day";
		else
			$str = $str . $days . " days";
	}
 
	if($hours != 0)
	{
		if($str != "")
			$str = $str . " ";
		if($hours == 1)
			$str = $str . $hours . " hour";
		else
			$str = $str . $hours . " hours";
	}
 
	if($minutes != 0)
	{
		if($str != "")
			$str = $str . " ";
		if($minutes == 1)
			$str = $str . $minutes . " minute";
		else
			$str = $str . $minutes . " minutes";
	}
 
	if($seconds != 0)
	{
		if($str != "")
			$str = $str . " ";
		if($seconds == 1)
			$str = $str . $seconds . " second";
		else
			$str = $str . $seconds . " seconds";
	}
 
	return $str. " ago";
}
 
function ClearResult($arr)
{
	for($i = 0; $i < count($arr); $i++)
	{
		if(gettype($arr[$i]) == "boolean")
		{
			 //echo "Found bool at $i";
			 array_splice($arr, $i, 1);
		}
	}
 
	return $arr;
}
 
function PrintArray($arr)
{
	for($i = 0; $i < count($arr); $i++)
	{
		echo $arr[$i];
		if($i + 1 != count($arr))
		{
			echo ", ";
		}
	}
}
 
if($format == "mod")
{
	LookForNicknames($find_name);
	LookForIPs($find_ip);
 
	$nicknames = ClearResult($nicknames);
	$addresses = ClearResult($addresses);
	$servers   = ClearResult($servers);
	$conn->close();
 
	/*if (!filter_var($find_ip, FILTER_VALIDATE_EMAIL) && $find_ip != "")
	{
	    $find_ip = $addresses[0];
	}*/
 
	if($find_ip == "")
	{
		$find_ip = $addresses[0];
	}
 
	if($find_ip == "")
	{
		$find_ip = "0.0.0.0";
	}
 
 
	if(count($nicknames) == 0 && count($addresses) == 0)
	{
		ReturnError("NOT_FOUND");
	}
 
	echo "!DATA!";
	echo "Nicknames used: "; PrintArray($nicknames); echo "*-*";
	echo "Total IPs used: "; echo count($addresses); echo "*-*";
	echo "Location: "; echo file_get_contents("http://127.0.0.1/db/getlocation.php?ip=$find_ip"); echo "*-*";
	echo "Connected: ";  echo count($times); echo " times*-*";
	SortTimes();
 
	if(GetTimestamp() - $times[0][0] < 60 * 60)
		echo "Last seen: " . GenerateLastSeenString($times[1][0]) . "*-*";
	else
		echo "Last seen: " . GenerateLastSeenString($times[0][0]) . "*-*";
 
	echo "First seen: " . GenerateLastSeenString($times[count($times)-1][0]);
	echo "!DATA!";
}
else if($format == "debug")
{
	LookForNicknames($find_name);
	LookForIPs($find_ip);
 
	$nicknames = ClearResult($nicknames);
	$addresses = ClearResult($addresses);
	$servers   = ClearResult($servers);
	$conn->close();
 
	/*if (!filter_var($find_ip, FILTER_VALIDATE_EMAIL) && $find_ip != "")
	{
	    $find_ip = $addresses[0];
	}*/
 
	if($find_ip == "")
	{
		$find_ip = $addresses[0];
	}
 
	if($find_ip == "")
	{
		$find_ip = "0.0.0.0";
	}
 
	if(count($nicknames) == 0 && count($addresses) == 0)
	{
		ReturnError("NOT_FOUND");
	}
 
	echo "Nicknames used: "; PrintArray($nicknames); echo "<br>";
	echo "IPs used: "; PrintArray($addresses); echo "<br>";
	echo "Location: "; echo file_get_contents("http://127.0.0.1/db/getlocation.php?ip=$find_ip"); echo "<br>";
	echo "Connected: ";  echo count($times); echo " times<br>";
	SortTimes();
	echo "Last seen: " . GenerateLastSeenString($times[0][0]) . "<br>";
	echo "First seen: " . GenerateLastSeenString($times[count($times)-1][0]) . "<br>";
	echo $find_name;
}
?>

The problem is that for some nicknames it returns a proper output which should look like this:

But sometimes it just returns lots and lots of data even if the nickname I ask for is unique enough:

Here's how the database looks:

I don't know what's wrong with the script because I'm a PHP beginner. If someone could take a look at it and tell me what's the issue I'd appreciate.