Php Date not working on the server - php

Question

for some reason the Php date isn't working on the server.
Here is the function for displaying the tip of the day. I am using the codeigniter framework. In the function below i am trying to print the day of year ($doy). When i go to the url and try to access the tip function it shows a blank page. The day of year is not printed.
public function tip(){
$idCount = $this->db->query('SELECT Count(*) AS COUNT FROM clickmag_tip')->result();
$total = $idCount[0]->COUNT;
$time = time();
$doy = mdate('%z', $time);
echo $doy;
//$day_of_year = date('z',time());
//$doyear = date("z") + 1;
//echo $doyear;
$s = mktime(date("G") + 1);
print date("Y/m/d h:i:s a", $s);
if($total > 0){
$offset = $doy % $total ;
}
$data = $this->db->query('SELECT * FROM table_tip LIMIT 1 OFFSET '. $offset);
header('Content-type: text/json');
header('Content-type: application/json');
echo json_encode($data->result());
}
What do you think is the problem? I talked to the server people but they also don't know.
How can i solve this?
Thanks in advance!

Answer 1

You must output all headers before outputting anything.
You have both:
echo $doy;
AND
print date("Y/m/d h:i:s a", $s);
Before
header('Content-type: text/json');
header('Content-type: application/json');
That is what's causing the blank page.