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HomeBackend DevelopmentPHP Tutorialphp数组函数序列之array_splice() - 在数组任意位置插入元素_php技巧

array_splice定义和用法

array_splice() 函数与 array_slice() 函数类似,选择数组中的一系列元素,但不返回,而是删除它们并用其它值代替。

如果提供了第四个参数,则之前选中的那些元素将被第四个参数指定的数组取代。

最后生成的数组将会返回。

语法
array_splice(array,offset,length,array)参数 描述
array 必需。规定数组。
offset 必需。数值。如果 offset 为正,则从输入数组中该值指定的偏移量开始移除。如果 offset 为负,则从输入数组末尾倒数该值指定的偏移量开始移除。
length 可选。数值。如果省略该参数,则移除数组中从 offset 到 结尾的所有部分。如果指定了 length 并且为正值,则移除这么多元素。如果指定了 length 且为负值,则移除从 offset 到数组末尾倒数 length 为止中间所有的元素。
array 被移除的元素由此数组中的元素替代。如果没有移除任何值,则此数组中的元素将插入到指定位置。

提示和注释
提示:如果函数没有删除任何元素 (length=0),则替代数组将从 start 参数的位置插入。(参见例子 3)

注释:不保留替代数组中的键。

例子 1
复制代码 代码如下:

$a1=array(0=>"Dog",1=>"Cat",2=>"Horse",3=>"Bird");
$a2=array(0=>"Tiger",1=>"Lion");
array_splice($a1,0,2,$a2);
print_r($a1);
?>

输出:

Array ( [0] => Tiger [1] => Lion [2] => Horse [3] => Bird )例子 2
与例子 1 相同,但是输出返回的数组:
复制代码 代码如下:

$a1=array(0=>"Dog",1=>"Cat",2=>"Horse",3=>"Bird");
$a2=array(0=>"Tiger",1=>"Lion");
print_r(array_splice($a1,0,2,$a2));
?>

输出:

Array ( [0] => Dog [1] => Cat )例子 3
length 参数设置为 0:
复制代码 代码如下:

$a1=array(0=>"Dog",1=>"Cat");
$a2=array(0=>"Tiger",1=>"Lion");
array_splice($a1,1,0,$a2);
print_r($a1);
?>

输出:

Array ( [0] => Dog [1] => Tiger [2] => Lion [3] => Cat )
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