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phparraysstring-interpolation

What do [], @ and {} mean in the context of this associative array declaration?

I have the following code 

$arr =  array(
     'media[]'  => "@{$image};type=image/jpeg;filename={$image}"
);

I do not know what line 2 means. What do the [], @ and {} stand for?

UPDATE:

This is a code extracted from Upload images on Twitter using PHP.

Used to upload images to Twitter. I need to implement the same in Lua. Hence this question.

Solution 
  • $arr =  array(
     'media[]'  => "@{$image};type=image/jpeg;filename={$image}",
);

    is just like

    $arr =  array(
     'media[]'  => "@".$image.";type=image/jpeg;filename=".$image,
);

    See the PHP manual for what the curly brackets ({}) mean in double-quoted strings.

    And for "[]" and "@" they are just normal strings.