Cannot modify header information - headers already sent by ERROR in php, json and mysql

Question

This is not like other question. I tried all other way. but still not working. It works locally, but error occurs when uploaded live.

<?php
header('content-type: application/json');
include('lib/functions.php');



if($_SERVER['REQUEST_METHOD']=="GET")
{
    $json = get_localtion_list();
    echo json_encode($json);  
}

What I tried:
ob_start() and ob_end_flush();
Then
changed header like this:

header('content-type: application/json;charset=utf-8');

I think the error happens only on php 7

I placed header first. But that doesn't work

Warning: Cannot modify header information - headers already sent by.../index.php on line 2

this include "include('lib/functions.php');" causes output. Even 1 space is too much. You cannot add headers after output. — Erwin Moller, Nov 04 '19 at 11:55
yes. i verified multiple times. theres no whitespace before and after php tags — Rupesh, Nov 04 '19 at 12:14
theres no problem in local server. but the error occurs in live server — Rupesh, Nov 04 '19 at 12:37
"Warning: Cannot modify header information - headers already sent by.../index.php on line 2" possibly you should check in index.php on line 2. The warning tells you that there are headers that are already sent. It's highly unlikely that the error message is wrong. — Félix Adriyel Gagnon-Grenier, Nov 04 '19 at 17:04

score 0 · Answer 1 · answered Nov 04 '19 at 11:57

0

Probably your 'lib/functions.php' file throws an error header which are sent first before your: header('content-type: application/json'); .

Try to switch places if possible: header('content-type: application/json'); include('lib/functions.php');

The best way is to fix the error which is occurring

answered Nov 04 '19 at 11:57

EdvinasPocius

173
2
10

1

i tried it. but that doesnt working – Rupesh Nov 04 '19 at 11:58

Cannot modify header information - headers already sent by ERROR in php, json and mysql

1 Answers1