如何在PHP上按日期获取星期几？

Question

I get date (ex. 2015-06-12) and i want to get day of week...

For example Monday = 1

$dateprog=$_GET['dateprog'];
$dow = date("N",$dateprog);

but it's not working

Answer 1

The variable $dateprog is in string format which you are extracting from the

$_GET['dateprog']

and parsing it as a parameter to the date function. However, the date function takes timestamp or date format as its second parameter

string date ( string $format [, int $timestamp = time() ] )

See documentation : Date

In order to convert the string to timestamp use the strtotime function as follows:

if(isset($_GET['dateprog']))
{
    $dateprog = $_GET['dateprog'];
    $dow = date("N",strtotime($dateprog));
    echo $dow;
}

Answer 2

Try with -

if (!empty($_GET['dateprog'])) {
    $dateprog=$_GET['dateprog'];
    $dow = date("N",strtotime($dateprog));
    echo $dow; // will print the day number of the week
}

Answer 3

just cast it to time:

$dateprog=$_GET['dateprog'];
$dow = date("N",strtotime($dateprog));

Answer 4

用这个

$dow = date("N",strtotime($dateprog));