White-Screen sobald eine bestimte Function mit aufgerufen wird.

<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);


class GeoApi
{
	private $db;

	private $get_plz = NULL;
	private $get_debug = NULL;
	private $get_city_id = NULL;

	private $city_id;
	private $state_id; //Bundesland
	private $county_id; //Kreis
	private $lat;
	private $lng;

	private $plz_exist;

	private $o_place;
	private $state;
	private $county;

	function __construct()
	{
		require_once 'system/classes/db.class.php';
		$this->db = new Database;


	}

	public function input ($get)
	{
		$this->get_plz = (isset($get['plz'])) ? $get['plz'] : NULL;
		$this->get_debug = (isset($get['debug'])) ? $get['debug'] : NULL;
		$this->get_city_id = (isset($get['city_id'])) ? $get['city_id'] : NULL;
		$this->_readCityByZip();
		$this->placeByCityId();
		$this->_readStateByPlace();
		$this->_readCountyByPlace(); // <== Das ist mein Problemkind!
		if($this->get_debug!=NULL) {
			if($this->get_plz!=NULL) {
				return $this->DebugPLZ();
			} elseif($this->get_city_id!=NULL) {
				return $this->DebugCity_id();
			}

		}elseif($this->get_plz!=NULL&&$this->plz_exist==FALSE) {
			$array = array("error" => "Die Postleitzahl $this->get_plz existiert nicht");
		} else {
			$array = array(
					"zipcode" => $this->get_plz,
					"place" => $this->o_place,
					"state" => $this->state,
					"county" => $this->county,
					"lat" => $this->lat,
					"lng" => $this->lng);
		}

		return json_encode($array);
	}

	function placeByCityId() 
	{
		try {
			$this->db->Query("SELECT * FROM `city` WHERE `id`=:id");
			$this->db->bind(':id', $this->city_id);
			$this->db->execute();
		} catch(PDOException $e) {
			die($e->getMessage());
		}

		$this->o_place = ($this->db->rowCount()==0) ? NULL : $this->db->fetch()->name;
		$this->state_id = ($this->db->rowCount()==0) ? NULL : $this->db->fetch()->state_id;
		$this->county_id = ($this->db->rowCount()==0) ? NULL : $this->db->fetch()->county_id;
		//$this->county_id ($this->db->rowCount()==0) ? NULL : $this->db->fetch()->county_id;
		//$this->lat ($this->db->rowCount()==0) ? NULL : $this->db->fetch()->lat;
		//$this->lng ($this->db->rowCount()==0) ? NULL : $this->db->fetch()->lng;
		//$this->state_id ($this->db->rowCount()==0) ? NULL : $this->db->fetch()->state_id;
	}

	function _readStateByPlace()
	{
		if($this->state_id==NULL) {
			return false;
		} else {
			try {
				$this->db->Query("SELECT * FROM `state` WHERE `id`=:state");
				$this->db->bind(':state', $this->state_id);
				$this->db->execute();
			} catch(PDOException $e) {
				die($e->getMessage());
			}

			$this->state = ($this->db->rowCount()==0) ? NULL : $this->db->fetch()->name;
		}
	}
	function _readCountyByPlace()
	{
		if($this->county_id==NULL) {
			return false;
		} else {
			try {
				$this->db->Query("SELECT * FROM `county` WHERE `id`=:county");
				$this->db->bind(':county', $this->county_id);
				$this->db->execute();

			}catch(PDOException $e) {
				die($e->getMessage());
			}

			//if($this->db->rowCount()==0) {die('failed');} else(die('okay'));
			$this->county = ($this->db->rowCount()==0) ? NULL : $this->db->fetch()->name;
		}
	}

	function _readCityByZip()
	{
		if($this->get_plz==NULL) {
			return false;
		} else {
			try {
				$this->db->Query("SELECT * FROM `zipcode` WHERE `zipcode`=:plz");
				$this->db->bind(':plz', $this->get_plz);
				$this->db->execute();
			}catch(PDOException $e) {
				die($e->getMessage());
			}

			$this->plz_exist = ($this->db->rowCount()==0) ? FALSE : TRUE;
			$this->city_id = ($this->db->rowCount()==0) ? 'NULL' : $this->db->fetch()->city_id;
		}
	}

	function DebugPLZ() 
	{
		if($this->get_plz=="") {
			$r = array("error" => "Keine Postleitzahl angegeben");
		} else {
			try 
			{
				$this->db->Query("SELECT * FROM `zipcode` WHERE `zipcode`=:plz");
				$this->db->bind(':plz', $this->get_plz);
				$this->db->execute();
				$r = $this->db->fetch(PDO::FETCH_ASSOC);
			} catch(PDOException $e) {
				$r = array("error" => $e->getMessage());
			}



		}
		return json_encode($r);
	}

	function DebugCity_id() 
	{
		if($this->get_city_id=="") {
			$r = array("error" => "Keine City_id angegeben");
		} else {
			try 
			{
				$this->db->Query("SELECT * FROM `city` WHERE `id`=:cityid");
				$this->db->bind(':cityid', $this->get_city_id);
				$this->db->execute();
				$r = ($this->db->rowCount()==0) ? array("error" => "Die City_id $this->get_city_id existiert nicht") : $this->db->fetch(PDO::FETCH_ASSOC);
			} catch(PDOException $e) {
				$r = array("error" => $e->getMessage());
			}



		}
		return json_encode($r);
	}
}


?>