將A和B添加到數組

Question

如何在數組已創建時將「A」和「B」添加到數組中？

已歷經這樣的：

$array1 = array("green", "red", "blue", "red"); 
$array2 = array("green", "yellow", "red"); 

想這個輸出評論後

$array1 = array("a" => "green", "red", "blue", "red"); 
$array2 = array("b" => "green", "yellow", "red"); 

Answer 1

編輯

$array1 = array("red","green","blue"); 
array_unshift($array1, "A");