PHP Questions!

<?php
if ($expression) {
    ?>
    <strong>This is true.</strong>
    <?php
} else {
    ?>
    <strong>This is false.</strong>
    <?php
}
?>

I am confused by this code.
Can anyone explain to me what happens if $expression is true? false?

#!/usr/bin/php -q
<?php
    $faggots = array("!","~","@","#","$","%","^","&","*","(",")");
    $x = intval($argv[1]);
  while ($x>0) {
        echo " I AM A HUGE FAGGOT PLEASE RAPE MY FACE";
        while (rand(1,7)>1) {
    $DURR = $faggots[rand(0,11)];
    echo $DURR.$DURR.$DURR;}
        $x--;
    }
?>