关于image：PHP – imagepng无法正常工作

PHP - imagepng not working properly

伙计们，首先，我的代码是：

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<?php

ob_start();

$pilot_id = $_GET['id'];

//-- Server Variables
$dbServer = 'localhost';
$dbUser = 'root';
$dbPassword = '*************';
$dbName = 'bla_tracker';

//-- Server Connection >>> DO NOT CHANGE <<<
$sql = mysql_connect("$dbServer","$dbUser","$dbPassword") or die(mysql_error());
$select_db = mysql_select_db("$dbName", $sql);

$query = mysql_query("SELECT * FROM acars_users WHERE `id`='".$pilot_id."'") or die (mysql_error());
$row = mysql_fetch_array($query);
$nome = $row['nome'];
$patente = $row['rank'];
$admin = $row['admin'];
$checador = $row['checador'];

$query_horas = mysql_query("SELECT SUM(flighttime) AS `total` FROM acars_pirep WHERE iduser='".$pilot_id."'") or die (mysql_error());
$row2 = mysql_fetch_assoc($query_horas);
$total_min = $row2['total'] + ($row['horas'] * 60);
$total = round($total_min/60);

if($admin == 1) {
$data ="Comandante Master - $nome";
} else {
if($checador == 1) {
$data ="Comandante Checador - $nome";
} else {
if($patente == '4') {
$data ="Comandante Sênior - $nome";
} else {
if($patente == '3') {
$data ="Comandante Instrutor - $nome";
} else {
if($patente == '2') {
$data ="Comandante - $nome";
} else {
if($patente == '1') {
$data ="Primeiro Oficial - $nome";
} else {
if($patente == '0') {
$data ="Copiloto - $nome";
}}}}}}}

$rand = rand(1, 8);

$my_img = imagecreatefrompng("images/background_$rand.png");
$background = imagecolorallocate($my_img, 0, 0, 255);
$text_colour = imagecolorallocate($my_img, 255, 255, 255);

imagettftext($my_img, 11, 0, 4, 12, $text_colour,"calibril.ttf","$data");
imagettftext($my_img, 11, 0, 340, 12, $text_colour,"calibril.ttf","$total hrs");
imagettftext($my_img, 11, 0, 4, 98, $text_colour,"calibril.ttf","Brasil Linhas Aéreas");
imagettftext($my_img, 11, 0, 323, 98, $text_colour,"calibril.ttf","voebla.com");

imagesetthickness ($my_img, 5 );

header("Content-type: image/png");
imagepng($my_img);
imagecolordeallocate( $text_color );
imagecolordeallocate( $background );
imagedestroy($my_img);

?>

我们更改了服务器，现在，我得到了：

enter image description here

发生什么事了？

编辑

如果将php错误设置为on，则会收到以下警告：

Warning: Cannot modify header information - headers already sent by (output started at C:\Inetpub\vhosts\voebla.com\httpdocs\BLAtracker\sessoes\pilotos\modules\dados\assinatura\assinatura.php:1) in C:\Inetpub\vhosts\voebla.com\httpdocs\BLAtracker\sessoes\pilotos\modules\dados\assinatura\assinatura.php on line 68

在第68行，我们有：

1	header("Content-type: image/png" );

编辑2

深入研究assinatura.php，我已经在php标记之前找到了一个bom，但是现在如何删除它？

enter image description here