之前我使用的是下面的代码。现在我需要更改此代码并替换file_get_contents() 具有wp_safe_remote_get(). 我需要知道如何设置\'header\' => "Accept: application/json" 在里面wp_safe_remote_get():

$opts = array(
        \'http\' => array(
            \'method\' => "GET",
            \'header\' => "Content-Type:application/json",
            \'header\' => "Accept: application/json"
        )
    );

$context = stream_context_create($opts);
$file =   file_get_contents( 
    \'http://xxxxxxxx.xxxx/xapix/xjson/xxxxx.php\',
     false, 
     $context
);

$args = array( \'timeout\' => 30 , \'header\' => "Accept: application/json");   
$file = wp_safe_remote_get(\'http://xxxxxxxx.xxxx/xapix/xjson/xxxxx.php\', $args);