<!-- Collection of code snippets by Arne Vajhøj -->
<!-- posted to eksperten.dk, usenet and other places (2002-now) -->
<?php
function isUserInArray($un, $a) {
    return in_array($un, array_map(function($v) { return $v['bruger']; }, $a));
}

$a = array(array('bruger' => 'ffsa', 'indhold' => 'Scrolltest'),
           array('bruger' => 'admin', 'indhold' => 'test'));
//print_r($a);
echo 'admin : ' . isUserInArray('admin', $a) . "\r\n";
echo 'adm : ' . isUserInArray('adm', $a) . "\r\n";
?>