PHP - 警告：无法修改标题信息 - 仍然卡住[重复]

Question

This question already has an answer here:

• How to fix “Headers already sent” error in PHP 11 answers

I know this has been asked a million times, but I've gone through all the answers to no avail, and as I only have a small amount of code, I figured it's a relatively simple fix (I hope). The frustrating thing is, is that php file works perfectly on one server, but not on another.

I'm receiving this error:

Warning: Cannot modify header information - headers already sent by (output started at /home/thepcguy/public_html/ship_image/functions/function-redirect.php:1) in /home/thepcguy/public_html/ship_image/functions/function-redirect.php on line 9

relating to this file

<?php require_once('../Connections/ships.php');

if ($_GET['shore'] == "1") {
   header('Location: ../shore_establishment.php?ship_id=' .urlencode($_GET['ship_id']) . "&shore=1" . "&page=ship");
   //echo"first";
} else if ($_GET['shore'] == "0") {
  header('Location: ../shipinfo.php?ship_id=' .urlencode($_GET['ship_id']). "&shore=0" . "&page=ship");
   //echo"second";
};

?>

For interests sake, the file ships.php is:

<?php
$hostname_ships = "xxxxx";
$database_ships = "xxxxx";
$username_ships = "xxxxx";
$password_ships = "xxxxx";
$ships = mysql_pconnect($hostname_ships, $username_ships, $password_ships); 
?>

</div>

Answer 1

Most likely you get notification that mysql_* is deprecated, and that is actually outputted to your browser, therefore you can't send headers since output is already sent...

Probably one server doesn't send notification, and other do, that's why it works on one, and not on other. To test set this as first line in you file:

error_reporting(E_ALL ^ E_DEPRECATED);