The lowercase L on the date function is used to display the full name of the day, like Monday. While changing it to d, it will display values or numbers from 1-7 which represents 7 days of the week. Changing it to D will display 3 letters, like for example: Mon, Tue, Wed, Thu, Fri, Sat, Sun.
I use switch statement. But you can also use if...elseif....else statement.
#
<html>
<?php
$day=Date("l");
echo "<h1>Today is"." ".$day;
switch($day)
{
case 'Monday':
echo "<body bgcolor='red'>";
break;
case 'Tuesday':
echo "<body bgcolor='yellow'>";
break;
case 'Wednesday':
echo "<body bgcolor='blue'>";
break;
case 'Thursday':
echo "<body bgcolor='green'>";
break;
case 'Friday':
echo "<body bgcolor='pink'>";
break;
case 'Saturday':
echo "<body bgcolor='orange'>";
break;
case 'Sunday':
echo "<body bgcolor='black'>";
break;
}
?>
</body>
</html>

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