将项目推送到PHP中的每个关联数组

Question

function array_push_multi_assoc($array, $key, $key2, $value){
    $array[$key][$key2] = $value;
    return $array;
}

$myarray = array_push_multi_assoc($myarray, $key=0, 'subject', 'hello');

print_r($myarray);

    Array
(
    [0] => Array
        (
            [id] => 97
            [email] => [e-mail]
            [subject] => hello
        )

    [1] => Array
        (
            [id] => 93
            [email] => [e-mail]
        )

    [2] => Array
        (
            [id] => 94
            [email] => [e-mail]
        )

)

I want to have something like that:

Array
(
    [0] => Array
        (
            [id] => 97
            [email] => [e-mail]
            [subject] => hello
        )

    [1] => Array
        (
            [id] => 93
            [email] => [e-mail]
            [subject] => hello
        )

    [2] => Array
        (
            [id] => 94
            [email] => [e-mail]
            [subject] => hello
        )

)

Answer 1

array_map can be used to build a new array, after applying a function to an existing one:

$newArray = array_map(function($row) {
    $row['subject'] = 'hello';
    return $row;
}, $oldArray);

Or use array_walk to manipulate the existing one:

array_walk($oldArray, function(&$row) {
    $row['subject'] = 'hello';
});

Note, you can rewrite either of these functions in a way that will mean their roles are reversed (e.g. building a new array with array_walk) but the examples above are how each should be used.