如何使用foreach重建用逗号分隔的一组数组？

Question

I'm using ACF Pro to get all my choices or specific field. I want to store these choice values into an array structure like this...

$mstars = array( 
    'relation' => 'OR',
array (
    'key' => 'product_owner',
    'value' => 'Bob Ross',
    'compare' => 'LIKE'
),
array(
    'key' => 'product_owner',
    'value' => 'Michael Jackson',
    'compare' => 'LIKE'
),
array(
    'key' => 'product_owner',
    'value' => 'Tom Hanks',
    'compare' => 'LIKE'
)

...Bob, Micheal and Tom are the only things coming from my select choices. The 'key' and 'compare' can be manully placed in my loop sense that never changes. How should I go about building that? This is what I have so far...

//I'm getting the ACF key to find my specific field
$field_key = "field_5b5b34f4ed085";
//I now have field data
$field = get_field_object($field_key);

//initiate an array
$mstars = [];
//loop through all my choices of this specific field
foreach($field['choices'] as $mkey => $mvalue) {
    //how do I add 'key' => 'product_owner', to each sub array?
    //how can I add Bob, Michael and Tom as values to each sub array?
    //how do I add compare => 'LIKE' to each sub array?
}

//I could then use $mstars[] where needed for get_posts() arguments

Many thanks on how to do this!

A var_dump of my choices looks like this...

var_dump($field['choices']);

array(6) { 
  ["Michael Jackson"]=> string(16) "Michael Jackson" 
  ["Bob Ross"]=> string(12) "Bob Ross" 
  ["Tom Hanks"]=> string(13) "Tom Hanks"
}

Answer 1

Assuming $mvalue is a string that contains the name you want:

foreach($field['choices'] as $mkey=>$mvalue){
    $mstars[] = array(
     'key'=> 'product_owner',
     'value'=> $mvalue,
     'compare'=> 'LIKE'
    );
}

$mstars['relation'] = 'OR';