syntax question

[182x]

Hey guys just wondering when displaying the following information how to I put a space between them? I have tried ' ' and .' '. but none of these work.

 

Thanks,

<?php echo $rowU1['username'], $rowU1['firstName']; ?>

[MadTechie]

heres a few

<?php echo $rowU1['username'].", ".$rowU1['firstName']; ?>

<?php echo "{$rowU1['username']}, {$rowU1['firstName']}"; ?>

<?php
echo $rowU1['username'];
echo ", ";
echo $rowU1['firstName'];
?>

<?php
$un =$rowU1['username']; 
$fn =$rowU1['firstName'];
echo "$un, $fn"; ?>

[182x]

Thanks