I have a simple template rendering system that includes a header, template and footer PHP file. The header has a single PHP function call to render a navigation bar. The template has a function call that sets a header('location ...'); and the footer is just basic HTML.
When I view the page, I get a 'headers already sent' error, specifying the line in the header that makes the call to echo out the navigation bar. If I modify the code to remove the child elements in the navigation, I don't get the 'headers already sent' error. The child elements are nothing more than array items. If I replace them with dummy text, then the page redirects correctly.
I imagine it's something very simple, but it has me stumped!
header.php (the int passed in specifies the depth to scan)
<ul class="nav navbar-nav"><?php echo getNavigation(1); ?></ul>
template.php
// Run from start
default:
$_SESSION['updateStart'] = microtime(true);
$_SESSION['updateErrors'] = array();
$_SESSION['updateLog'] = array();
header('location: /update-products?action=getDataFeeds');
exit();
break;
getNavigation function:
function getNavigation($depth) {
global $path, $misc;
$items = $misc->getNavigation(1,(int)$depth,true);
$nav = "";
if($items) {
foreach($items as $item) {
$class = ($item['ob_alias']==("/".$path[0])?' class="active"':'');
$nav .= '<li'.$class.'>';
if(isset($item['children'])) {
$nav .= '<a href="#" class="dropdown-toggle" data-toggle="dropdown">'.$item['ob_label'].' <span class="caret"></span></a>';
$nav .= '<ul class="dropdown-menu" role="menu">';
foreach($item['children'] as $child) {
$class = ((isset($path[1]) && $child['ob_alias']==("/".$path[1]))?' class="active"':'');
$nav .= '<li'.$class.'><a href="'.$child['ob_alias'].'">'.$child['ob_label'].'</a></li>';
}
$nav .= '</ul>';
} else {
$nav .= '<a href="'.$item['ob_alias'].'">'.$item['ob_label'].'</a>';
}
$nav .= '</li>';
}
}
return $nav;
}
I've tried to walk through my code and all that I can seem to do to toggle the error Vs. having the page run as expected is to replace this line in my getNavigation() call:
$nav .= '<li'.$class.'><a href="'.$child['ob_alias'].'">'.$child['ob_label'].'</a></li>';
with
$nav .= '<li>Some dummy text</li>';
Then it's fine. I can't see why including the two array item strings would break the 'headers'.
Any help, or pointers for things to test would be most welcome.
