如何在特定位置将元素插入数组? [英] How to insert element into arrays at specific position?

问题描述

假设我们有两个数组:

$array_1 = 数组('0' =>'零'，'1' =>'一'，'2' =>'二'，'3' =>'三'，);$array_2 = 数组('零' =>'0','一个' =>'1','两个' =>'2','三' =>'3',);

现在，我想在每个数组的第三个元素之后插入 array('sample_key' => 'sample_value').我该怎么做?

解决方案

array_slice() 可用于提取数组的一部分，联合数组运算符(+) 可以重新组合部分.

$res = array_slice($array, 0, 3, true) +数组("my_key" => "my_value") +array_slice($array, 3, count($array)-3, true);

这个例子:

$array = array('零' =>'0','一个' =>'1','两个' =>'2','三' =>'3',);$res = array_slice($array, 0, 3, true) +数组("my_key" => "my_value") +array_slice($array, 3, count($array) - 1, true) ;打印_r($res);

给出:

<前>大批([零] => 0[一] => 1[二] => 2[my_key] => my_value[三] => 3)

Let's imagine that we have two arrays:

$array_1 = array(
  '0' => 'zero',
  '1' => 'one',
  '2' => 'two',
  '3' => 'three',
);

$array_2 = array(
  'zero'  => '0',
  'one'   => '1',
  'two'   => '2',
  'three' => '3',
);

Now, I'd like to insert array('sample_key' => 'sample_value') after third element of each array. How can I do it?

解决方案

array_slice() can be used to extract parts of the array, and the union array operator (+) can recombine the parts.

$res = array_slice($array, 0, 3, true) +
    array("my_key" => "my_value") +
    array_slice($array, 3, count($array)-3, true);

This example:

$array = array(
  'zero'  => '0',
  'one'   => '1',
  'two'   => '2',
  'three' => '3',
);
$res = array_slice($array, 0, 3, true) +
    array("my_key" => "my_value") +
    array_slice($array, 3, count($array) - 1, true) ;
print_r($res);

gives:

Array
(
    [zero] => 0
    [one] => 1
    [two] => 2
    [my_key] => my_value
    [three] => 3
)

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