PHP中的數組（數據結構）

array_pop

將數組最後一個單元彈出（出棧）

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

將一個或多個單元壓入數組的末尾（入棧）

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

將數組開頭的單元移出數組

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

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

array_unshift

在數組開頭插入一個或多個單元

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

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

參考

• PHP手冊