PHP中的数组（数据结构）

array_pop

将数组最后一个单元弹出（出栈）

$arr = [11=>11,22=>22,33=>33,44=>44];
print_r($arr);
array_pop($arr);
print_r($arr);

Array
(
    [11] => 11
    [22] => 22
    [33] => 33
    [44] => 44
)
Array
(
    [11] => 11
    [22] => 22
    [33] => 33
)

array_push

将一个或多个单元压入数组的末尾（入栈）

$arr = [11=>11,22=>22,33=>33,44=>44];
print_r($arr);
array_push($arr,55);
print_r($arr);

Array
(
    [11] => 11
    [22] => 22
    [33] => 33
    [44] => 44
)
Array
(
    [11] => 11
    [22] => 22
    [33] => 33
    [44] => 44
    [45] => 55
)

array_shift

将数组开头的单元移出数组

$arr = [11=>11,22=>22,33=>33,44=>44];
print_r($arr);
array_shift($arr);
print_r($arr);

Array
(
    [0] => 22
    [1] => 33
    [2] => 44
)

array_unshift

在数组开头插入一个或多个单元

$arr = [11=>11,22=>22,33=>33,44=>44];
print_r($arr);
array_unshift($arr, 55);
print_r($arr);

Array
(
    [11] => 11
    [22] => 22
    [33] => 33
    [44] => 44
)

参考

• PHP手册