php 数组 select 元素依赖于其他数组

Question

i have an array for weeks days like this

$daysNumber=array(1,2,3,4,5,6,7);

I need to convert it to names like this

$daysName = array('sunday', 'monday', 'tuesday', 'wednesday', 'thursday', 'friday','saturday');

the days numbers it's dynamic the user selects them and i get the array for example like this (1,3,4) i want to replace each number with the day name like this (Sunday,Tuesday,wednesday)

what is the best option to convert it

Answer 1

You can drop the $daysNumber variable and start the $daysName at 1 rather than 0.

You can then use array_key_intersect() and array_flip() to extract the days you are after...

$daysName = array( 1=> 'sunday', 'monday', 'tuesday', 'wednesday', 'thursday', 'friday','saturday');

$selected = [1,3,4];

print_r(array_intersect_key($daysName, array_flip($selected)));

gives...

Array
(
    [1] => sunday
    [3] => tuesday
    [4] => wednesday
)

Answer 2

Your array $daysName is enough:

$daysName = array('sunday', 'monday', 'tuesday', 'wednesday', 'thursday', 'friday','saturday');

As it is zero-indexed, its indexes correspond to your $daysNumber as index - 1 .

So for 1,3,4 you output:

$daysName[0];  // 1 - 1
$daysName[2];  // 3 - 1
$daysName[3];  // 4 - 1

But if you still need you can reindex your $daysName starting from 1:

$daysName = array(1 => 'sunday', 2 => 'monday', 3 => 'tuesday'); // etc

Answer 3

You can try date with array_map

$alphaDays = array_map(function($d){
    $d--;
    return date('l', strtotime("Sunday + $d Days"));
}, $days);
print_r($alphaDays);

Working example:- https://3v4l.org/aCDRh