Массив Push с ассоциативным массивом?

Question

$row_properties = array(
                         "Header 11"=>array("width"=>20,"align"=>'C',"color"=>array(100,220,255),"text_color"=>array(220,50,50)),
                         "Header 12"=>array("width"=>20,"align"=>'C',"color"=>array(100,220,255),"text_color"=>array(220,50,50) )

);

Как я могу выдвинуть значения

"Header 13"=>array("width"=>20,"align"=>'C',"color"=>array(100,220,255) ,"text_color"=>array(220,50,50)),
"Header 14"=>array("width"=>20,"align"=>'C',"color"=>array(100,220,255) ,"text_color"=>array(220,50,50)),

ТАК получится результат

$row_properties = array(
"Header  11"=>array("width"=>20,"align"=>'C',"color"=>array(100,220,255),"text_color"=>array(220,50,50)),
"Header12"=>array("width"=>20,"align"=>'C',"color"=>array(100,220,255),"text_color"=>array(220,50,50),
"Header 13"=>array("width"=>20,"align"=>'C',"color"=>array(100,220,255) ,"text_color"=>array(220,50,50)),
"Header 14"=>array("width"=>20,"align"=>'C',"color"=>array(100,220,255) ,"text_color"=>array(220,50,50))
                  )
              );

Answer 1

Пробовал функцию array_merge()?

Answer 2

Простой

$row_properties["Header 13"] = array("width"=>20,"align"=>'C',"color"=>array(100,220,255) ,"text_color"=>array(220,50,50));

Answer 3

Может быть, что-то вроде этого:

$push_vals = array(
    "Header 13"=>array("width"=>20,"align"=>'C',"color"=>array(100,220,255) ,"text_color"=>array(220,50,50)),
    "Header 14"=>array("width"=>20,"align"=>'C',"color"=>array(100,220,255) ,"text_color"=>array(220,50,50)),
);

$arr = array(
     "Header 11"=>array("width"=>20,"align"=>'C',"color"=>array(100,220,255),"text_color"=>array(220,50,50)),
     "Header 12"=>array("width"=>20,"align"=>'C',"color"=>array(100,220,255),"text_color"=>array(220,50,50)
);

foreach ($push_vals as $key=>$value){
    if ( isset($arr[$key]) ) 
        $arr = array_merge($arr[$key], $push_vals[$key]);
    else
        $arr[$key] = $push_vals[$key];

}

Обновление

durrr array_merge_recursive