用foreach更改对象的数组值

Question

i want create an array of object like this:

[

    'A' => { 'name':'name1', 'family':'family1'},

    'B' => { 'name':'name2', 'family':'family2'},

    'C' => { 'name':'name3', 'family':'family3'},

    'D' => { 'name':'name4', 'family':'family4'},

    'E' => { 'name':'name5', 'family':'family5'},

    'F' => { 'name':'name6', 'family':'family6'},

];

i have an array contine name and other array contine family, so i use foreach loop. but result is a Amazing. why loop in each, change all names and all family?

$name    = [
    'A'=>'name1',
    'B'=>'name2',
    'C'=>'name3',
    'D'=>'name4',
    'E'=>'name5',
    'F'=>'name6'
];
$family  = [
    'A'=>'family1',
    'B'=>'family2',
    'C'=>'family3',
    'D'=>'family4',
    'E'=>'family5',
    'F'=>'family6'
];
$key     = array_keys( $name );
$myArray = array_fill_keys( $key, new stdClass() );

foreach( $myArray as $k => $info ){
    $myArray[$k]->name = $name[$k];
    $myArray[$k]->family = $family[$k];
}

and this is a result

[

    'A' => { 'name':'name6', 'family':'family6'},

    'B' => { 'name':'name6', 'family':'family6'},

    'C' => { 'name':'name6', 'family':'family6'},

    'D' => { 'name':'name6', 'family':'family6'},

    'E' => { 'name':'name6', 'family':'family6'},

    'F' => { 'name':'name6', 'family':'family6'},

];

Answer 1

This would be simpler

$name    = [
    'A'=>'name1',
    'B'=>'name2',
    'C'=>'name3',
    'D'=>'name4',
    'E'=>'name5',
    'F'=>'name6'
];
$family  = [
    'A'=>'family1',
    'B'=>'family2',
    'C'=>'family3',
    'D'=>'family4',
    'E'=>'family5',
    'F'=>'family6'
];

foreach( $name as $k => $info ){
    $t = new stdClass();
    $t->name = $info;
    $t->family = $family[$k];
    $myArray[$k] = $t;
}

RESULT

Array
(
    [A] => stdClass Object
        (
            [name] => name1
            [family] => family1
        )
    [B] => stdClass Object
        (
            [name] => name2
            [family] => family2
        )
    [C] => stdClass Object
        (
            [name] => name3
            [family] => family3
        )
    [D] => stdClass Object
        (
            [name] => name4
            [family] => family4
        )
    [E] => stdClass Object
        (
            [name] => name5
            [family] => family5
        )
    [F] => stdClass Object
        (
            [name] => name6
            [family] => family6
        )
)

Then if you do a json_encode() on that you get what you want

echo json_encode($myArray);

{
    "A": {
        "name": "name1",
        "family": "family1"
    },
    "B": {
        "name": "name2",
        "family": "family2"
    },
    "C": {
        "name": "name3",
        "family": "family3"
    },
    "D": {
        "name": "name4",
        "family": "family4"
    },
    "E": {
        "name": "name5",
        "family": "family5"
    },
    "F": {
        "name": "name6",
        "family": "family6"
    }
}

UPDATE: Why you had a problem with your code

This line

$myArray = array_fill_keys( $key, new stdClass() );

is filling an array with a reference to a single object.

Therefore when you load data into the object in the array you are filling a single object with some data. That object is referenced (pointed to) in all your array occurances. So you only see data loaded in the last iteration of the loop in all the array occurances.

A simple test for example

$name    = [
'A'=>'name1',
'B'=>'name2',
'C'=>'name3',
'D'=>'name4',
'E'=>'name5',
'F'=>'name6'
];
$family  = [
    'A'=>'family1',
    'B'=>'family2',
    'C'=>'family3',
    'D'=>'family4',
    'E'=>'family5',
    'F'=>'family6'
];

$key     = array_keys( $name );
$myArray = array_fill_keys( $key, new stdClass() );

// looks like it should fill only the object in the first 'A' occurance
$myArray['A']->one = 1;
print_r($myArray);

RESULT

Array
(
    [A] => stdClass Object ( [one] => 1 )
    [B] => stdClass Object ( [one] => 1 )
    [C] => stdClass Object ( [one] => 1 )
    [D] => stdClass Object ( [one] => 1 )
    [E] => stdClass Object ( [one] => 1 )
    [F] => stdClass Object ( [one] => 1 )
)