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if (condition)
{
    code to be executed if condition is true;
}

<?php
$t = date("H");
if ($t < "20")
{
    echo "Have a good day!";
}
?>

<?php
$t = date("H");
if ($t < "20")
{
    echo "Have a good day!";
}
else
{
    echo "Have a good night!";
}
?>

if (condition)
{
    code to be executed if condition is true;
}
elseif (condition)
{
    code to be executed if elseif condition is true;
}
else
{
    code to be executed if none of the above conditions are true;
}

<?php
$t = date("H");
if ($t < "10")
{
    echo "Have a good morning!";
}
elseif ($t < "20")
{
    echo "Have a good day!";
}
else
{
    echo "Have a good night!";
}
?>