PHP day of week numeric to day of week text

Question

This may be really easy but I can't find a PHP function to do this...

OK so

$dow_numeric = date('w');

gives the numeric day of the week 0-6 for Sunday to Saturday.

And

$dow_text = date('D');

gives the 3 letter abbreviation for the text day of the week (Sun, Mon, etc.)

Is there a function or easy way to use $dow_numeric to get $dow_text ? If I have '0' as $dow_numeric , how can I make $dow_text = 'Sun' ? Yes a switch statement could do the job, but I'm looking for a more elegant solution.

Answer 1

有点黑客，但是：

$dow_text = date('D', strtotime("Sunday +{$dow_numeric} days"));

Answer 2

It's not popular, but there's actually a function jddayofweek for this in PHP. You can call it with the second parameter as 1 to get full gregorian week day name or 2 for the abbreviated name.

e.g. jddayofweek(2, 2); #returns Wed

Note that for this function, numbers start at Monday. So Monday=0, Tuesday=1, ...

Answer 3

Create an array to map numeric DOWs to text DOWs.

$dowMap = array('Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat');

If you need locale support, load the dow of some random date (epoch (0) would be a good date for example) and then for the next 6 days and build the dow map dynamically.

Answer 4

To get Sunday to Saturday from numeric day of the week 0 to 6 :

//For example, our target numeric day is 0 (Sunday):
$numericDay = 0; //assuming current date('w')==0 and date('D')=='Sun';

Solution-1: Using PHP's built-in function jddayofweek() which starts from Monday whereas date('w') starts from Sunday :

jddayofweek($numericDay-1, 1); //returns 'Sun', here decreasing by '-1' is important(!)

//jddayofweek(0, 1); //returns 'Mon';
//jddayofweek(0, 2); //returns 'Monday';

Solution-2: Using a trick(!):

date('D', strtotime("Sunday +{$numericDay} days")); //returns 'Sun';

//date('l', strtotime("Sunday +{$numericDay} days")); //returns 'Sunday';

Answer 5

function getDay(){
    $dowMap = array('Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday');
    $dow_numeric = date('w');
    return $dowMap[$dow_numeric];
}

Answer 6

This should work:

$dow_numeric = 3;

$last_sunday = strtotime('last Sunday');
$dow_text = date('D', strtotime('+'.$dow_numeric.' day', $last_sunday));

Answer 7

If you need locale support you can use a bit improved function of Hamishs answer :

Example using german weekdays:

setlocale(LC_TIME, 'de_DE');
$dow_numeric = 3;
$dow_text = strftime('%A', strtotime("Sunday +{$dow_numeric} days"));

http://php.net/strftime

If $dow_numeric start on 0 ( 0 = Monday) you can just change Sunday to Monday or add $dow_numeric += 1