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Replace array value with new

I have an array of array where I want to change the date format. I am trying to get it like below

foreach ($toReturn as $value) {

    $start_date = new DateTime($value['start_date']);
    $value['start_date'] = $start_date->format('m-d-Y');

    $end_date = new DateTime($value['end_date']);
    $value['end_date'] = $end_date->format('m-d-Y');
}

here the format changes, but it does not replace the array value with the new one. What for??

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5 answers


You must use the refrence operator &

to modify the original array, otherwise PHP will treat it as a local one that is different from the original, and changes to that local array will not be reflected in the original array.



foreach ($toReturn as &$value) {

    $start_date = new DateTime($value['start_date']);
    $value['start_date'] = $start_date->format('m-d-Y');

    $end_date = new DateTime($value['end_date']);
    $value['end_date'] = $end_date->format('m-d-Y');
}
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If you want to change the value in foreach, you need to access it by reference.



change foreach ($toReturn as $value)

toforeach ($toReturn as &$value)

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You need to change the value from the link:

foreach ($toReturn as &$value) {

    $start_date = new DateTime($value['start_date']);
    $value['start_date'] = $start_date->format('m-d-Y');

    $end_date = new DateTime($value['end_date']);
    $value['end_date'] = $end_date->format('m-d-Y');
}
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Alternatively, if you don't want to use the Pass by Reference method, you can use that or even create a new variable.

foreach ($toReturn as $key => $value) {

    $start_date = new DateTime($value['start_date']);
    $toReturn[$key]['start_date'] = $start_date->format('m-d-Y');

    $end_date = new DateTime($value['end_date']);
    $toReturn[$key]['end_date'] = $end_date->format('m-d-Y');
}

Note . If you want to use reference pass, remember to undo ($ value) after the loop , which is not needed for this example .. p>

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You can also use access $toReturn[$index] 

foreach ($toReturn as $index => $value) {

    $start_date = new DateTime($value['start_date']);
    $toReturn[$index]['start_date'] = $start_date->format('m-d-Y');

    $end_date = new DateTime($value['end_date']);
    $toReturn[$index]['end_date'] = $end_date->format('m-d-Y');
}
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