提取对象属性以在数组中使用

Question

I have a JSON string with some values that I unserialized into an object (STDClass/Object).

There are a couple of values in it, but I have to extract exactly 8 of those values into an multidimensional array. This snippet shows the values I'm after as they existed in the JSON:

"picture1":"path/to/image/picture1.jpg"
"picture1_color":"#000000"
"picture2":"path/to/image/picture2.jpg"
"picture2_color":"#111111"
"picture3":"path/to/image/picture3.jpg"
"picture3_color":"#222222"
"picture4":"path/to/image/picture4.jpg"
"picture4_color":"#333333"

I want to extract these values and put them into an array like this:

Array
(
    [0] => Array
        (
            [picture] => path/to/image/picture1.jpg
            [color] => #000000
        )

    [1] => Array
        (
            [picture] => path/to/image/picture2.jpg
            [color] => #111111
        )

and so forth


)

Is this doable programmatically or do I just need to do it by hand?

Answer 1

Working with all conditions you've provided (your original data structure, un-serialization into an object instead of an array, etc.), and assuming they're all non-negotiable, this is how I would extract the pieces you're looking for:

$json_serialized_input = '{"something":"foo","something_else":"bar","picture1":"path/to/image/picture1.jpg","picture1_color":"#000000","picture2":"path/to/image/picture2.jpg","picture2_color":"#111111","picture3":"path/to/image/picture3.jpg","picture3_color":"#222222","picture4":"path/to/image/picture4.jpg","picture4_color":"#333333"}';  

$input = json_decode($json_serialized_input);

$output = [];
for ($i = 1; $i <= 4; $i++) {
    $current_picture_property = 'picture' . $i;
    $current_color_property = $current_picture_property . '_color';

    $output[] = [
        'picture' => $input->{$current_picture_property},
        'color' => $input->{$current_color_property},
    ];
}

var_dump($output);

This is just a procedural example of the concepts. In an actual program I'd make a function/method that takes the input and produces the output. That function might even take starting and ending numbers to loop for, and maybe some sort of params for specifying a template for the property names. That all depends on how general purpose your needs are or are not.

Anyway, the code I gave above should produce:

array(4) {
  [0]=>
  array(2) {
    ["picture"]=>
    string(26) "path/to/image/picture1.jpg"
    ["color"]=>
    string(7) "#000000"
  }
  [1]=>
  array(2) {
    ["picture"]=>
    string(26) "path/to/image/picture2.jpg"
    ["color"]=>
    string(7) "#111111"
  }
  [2]=>
  array(2) {
    ["picture"]=>
    string(26) "path/to/image/picture3.jpg"
    ["color"]=>
    string(7) "#222222"
  }
  [3]=>
  array(2) {
    ["picture"]=>
    string(26) "path/to/image/picture4.jpg"
    ["color"]=>
    string(7) "#333333"
  }
}