array_unshift
$a = array("a" => "red", "b" => "green");
print_r($a);
array_unshift($a,"blue");
print_r($a);
运行结果
Array
(
[a] => red
[b] => green
)
Array
(
[0] => blue
[a] => red
[b] => green
)
Array
(
[a] => red
[b] => green
)
Array
(
[0] => blue
[a] => red
[b] => green
)