如何使用foreach循环中的现有数组值在PHP中创建新数组

Question

I have an array ($datesandadults) with pairs of values which are the date and the number of people:

Array ( 
    [0] => stdClass Object ( 
            [thedate] => April 9, 2016 
            [theadults] => 6
        ) 
    [1] => stdClass Object ( 
            [thedate] => April 10, 2016 
            [theadults] => 9 
        )
...

I need to modify thedate value then put everything back into a new similar structured array. my code doesn't work, all it gives is:

Array ( 
    [0] => date 
    [1] => adults 
    [thedate] => 2016-04-09 
    [adults] => ) 

The code I am using is:

$final_results = array('thedate','adults');

foreach ($datesandadults as $res2) {
    foreach( $res2 as $key => $value) {
        if ($key=='thedate') {
            $actualtime=strtotime($value);
            $value = date('Y-m-d', $actualtime);
        }

        $final_results[thedate] = $res2->thedate;
        $final_results[adults] = $res2->adults;
    }
}

I know my current code is nonsense but maybe will give an idea what I need..

Answer 1

You have an array of objects, not arrays. You need to loop through the objects, creating a new array. You can access the object properties directly, so you do not need the interior foreach loop.

// initialize empty result array
$final_results = []; // use array() for PHP < 5.4

foreach ($datesandadults as $res2) {

   // convert original date value
   $actualtime = strtotime($res2->thedate);
   $date_value = date('Y-m-d', $actualtime);

   // create new object with updated values
   $new_object = (object) array(
       'thedate' => $date_value,
       'theadults' => $res2->theadults
   );

   // add new object to result array
   $final_results[] = $new_object;
}