PHP-Scripts Blog » one liners

Date and time page last updated

TDavid — Thu, 29 Mar 2007 16:22:05 +0000

A PHP one-liner to keep the date/time the page was last updated:

page last updated echo date(“F d Y H:i:s”, getlastmod() ); ?>

Note: uses the server timezone by default. getlastmod() returns a timestamp and if you are on a shared server (virtual hosting) and cannot change the timezone, let’s say the timezone is off by two hours just use the following:

page last updated echo date(“F d Y H:i:s”, (getlastmod() - 7200) ); ?>

Random web page background colors

TDavid — Fri, 14 Jul 2006 13:51:01 +0000

If you want to create a random background color

$hex = dechex(rand(0,255)) . dechex(rand(0,255)) . dechex(rand(0,255)); ?>

and then you’d use the following in your body tag:

“#”>

Is number odd or even?

TDavid — Fri, 04 Nov 2005 18:13:20 +0000

Testing whether a number is odd or even in PHP. The custom function is_odd() below is inspired by an algorithms thread at Devshed. The function isn’t even necessary and could be expressed as a one-liner like this:

echo($number & 1); // $number = any integer, 0 = even, 1 = odd

Here’s the code to check the hours in the day starting with 0 (midnight) and ending at midnight (23):

function is_odd($number) {
return $number & 1; // 0 = even, 1 = odd
}

foreach(range(0,23) as $number) {
print “$number “ . is_odd($number) . ‘
’;
}
?>

Notes: The range function is handy for prefilling with a string or array with numbers. Now what if you want to show alternating messages, one on the even hours and one on odd hours? The following code will do just that if you change the print statement to be whatever you want to alternate:

function is_odd($number) {
return $number & 1; // 0 = even, 1 = odd
}

if(is_odd(date(“H”))) {
print “Since it’s an odd hour, I’ve got an odd message for you: read and be happy”;
} else {
print “It’s an even hour, Steven.”;
}
?>

Update 10/9/08 7:16am PST: Thanks to several commenters below who pointed out that there was a missing ‘)’ — it has been added now.