我正在尝试将数组插入到特定位置的二维数组中。 根据手册,我应该可以使用array_splice()执行此操作,但它只删除接收数组的内容而不插入。
我想得到一个包含$ receivingArray的所有值(数组)加上新值(数组)的数组。
我做错了什么?
手册信息:
array array_splice(array& $ input,int $ offset [,int $ length [,mixed $ replacement = array()]])
如果指定了length并且为零,则不会删除任何元素。 如果替换只是一个元素,则不必将array()放在>周围。除非元素本身是一个对象,否则为NULL。
输入:
$newArray = array_splice($receivingArray, 0, 0, array($value));
结果:$ newArray是一个空数组
输入:
$newArray = array_splice($receivingArray, 1, 0, array($value));
结果:$ newArray是一个空数组
此输入:
print_r($receivingArray);
print_r(array($value));
$newArray = array_splice($receivingArray, 1, 1, array($value));
print_r($newArray);
给出:(有趣的是)
Array
(
[0] => Array
(
[id] => 1
[primaryID] => 0
[category_id] => 1
[title] => sports
[description] =>
[selected] =>
[level] => 0
)
[1] => Array
(
[id] => 4
[primaryID] => 0
[category_id] => 0
[title] => programming
[description] =>
[selected] =>
[level] => 0
)
)
Array
(
[0] => Array
(
[id] => 2
[primaryID] => 1
[category_id] => 1
[title] => soccer
[description] =>
[selected] =>
[level] => 1
)
)
Array
(
[0] => Array
(
[id] => 4
[primaryID] => 0
[category_id] => 0
[title] => programming
[description] =>
[selected] =>
[level] => 0
)
)
答案 0 :(得分:2)
返回值
返回由提取的元素组成的数组。
$newArray = array_splice($receivingArray, 0, 0, array($value));
array_splice会修改其输入,因此您要查找的结果位于$receivingArray
而不是$newArray
答案 1 :(得分:1)
我错过了array_slice()实际上不返回其输出的事实,而是作用于接收数组本身,它通过引用传递。我没有注意到手册规范中第一个参数前面有一个ammpersand。
此输入:
print_r($receivingArray);
print_r(array($value));
array_splice($receivingArray, 0, 0, array($value));
print_r($receivingArray);
给出了正确的结果:
Array
(
[0] => Array
(
[id] => 1
[primaryID] => 0
[category_id] => 1
[title] => sports
[description] =>
[selected] =>
[level] => 0
)
[1] => Array
(
[id] => 4
[primaryID] => 0
[category_id] => 0
[title] => programming
[description] =>
[selected] =>
[level] => 0
)
)
Array
(
[0] => Array
(
[id] => 2
[primaryID] => 1
[category_id] => 1
[title] => soccer
[description] =>
[selected] =>
[level] => 1
)
)
Array
(
[0] => Array
(
[id] => 1
[primaryID] => 0
[category_id] => 1
[title] => sports
[description] =>
[selected] =>
[level] => 0
)
[1] => Array
(
[id] => 2
[primaryID] => 1
[category_id] => 1
[title] => soccer
[description] =>
[selected] =>
[level] => 1
)
[2] => Array
(
[id] => 4
[primaryID] => 0
[category_id] => 0
[title] => programming
[description] =>
[selected] =>
[level] => 0
)
)