If problems

Hi, I am trying to create a if sequense, but I don’t have any luck:

<?php // Works inside of the Loop
function function_name() {
global $post;
$thePostID = $post->ID;
} ?>
<?php foreach(get_field('matcher') as $matcher): ?>
<?php foreach( get_post_meta($matcher->ID, 'vinnare') as $vinnare): ?>
<?php foreach( get_post_meta($matcher->ID, 'vinnarenamn') as $vinnarenamn): ?>
<?php foreach( get_post_meta($matcher->ID, 'forlorarenamn') as $forlorarenamn): ?>							

<?php echo $thePostID          /// Just for testing?>
<?php echo $vinnare ?>
<?php if ($vinnare == $thePostID) { ?>
Test
<?php }?>

My problem is that the $thePostID don’t return any value – so I guess thats why the if statement don’t work…
Can anybody help me?