将 A 和 B 添加到数组

Question

当“A”和“B”都已创建后，如何将它们添加到数组中？

已经准备好了：

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

想要这个输出

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

Answer 1

评论后编辑

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