根据数据库字段中保存的Y：m：d格式获取星期几（星期一，星期二，星期三）

Question

I have a database table called 'transactions' with the field 'actualdate' that has the date of each row saved like 2014-09-13 .

I'm displaying the results using this query:

"SELECT id,actualdate, SUM(points) FROM transactions GROUP BY DAY(actualdate) ORDER BY id DESC limit 7"

Then displaying the results with:

while($row = mysqli_fetch_array($result) ) {
    echo "<li>";
    echo $row['actualdate'];
    echo " ";
    echo $row['SUM(points)'];
    echo "</li>";
}

Is it possible to echo what day of the week it was for each summed result based on the date the way it's formatted?

Thanks.

Answer 1

Yes of course, you can use Datetime in this case:

$row['actualdate'] = '2014-09-13';
$date = new DateTime($row['actualdate']);
echo $date->format('l'); // l represents Monday, Tuesday,
// in this case "Saturday"

// For three letter representations use this:
echo $date->format('D'); // Sat

Applying it:

while($row = mysqli_fetch_assoc($result) ) {
    echo "<li>";
    $date = new DateTime($row['actualdate']);
    echo $date->format('D');
    echo " ";
    echo $row['SUM(points)'];
    echo "</li>";
}

Answer 2

如果只有那一天

$day=date( 'l', strtotime($row['actualdate']) );