PHP method to merge two numeric key array values

This article mainly introduces the method of merging two numeric key array values ​​​​in PHP, involving PHP's array traversal, judgment, conversion and other related operating skills. Friends in need can refer to the example of this article

Describes a simple method of merging two numeric key array values ​​in PHP. Share it with everyone for your reference, as follows:

First you need to understand a basic knowledge point: analysis of the difference between PHP merging arrays and array_merge

<?php
/**
 * PHP合并2个数字键数组的值
 *
 * @param array $arr1
 * @param array $arr2
 * @return array
 */
function new_array_merge($arr1, $arr2)
{
  if (!is_array($arr1) || !is_array($arr2))
  {
    return array();
  }
  $arr = array_flip($arr1) + array_flip($arr2);
  return array_keys($arr);
}
$arr1 = array(&#39;aa&#39;, &#39;bb&#39;, &#39;cc&#39;);
$arr2 = array(&#39;aa2&#39;, &#39;bb&#39;, &#39;cc2&#39;);
$arr = new_array_merge($arr1, $arr2);
print_r($arr);

Output:

Array
(
  [0] => aa
  [1] => bb
  [2] => cc
  [3] => aa2
  [4] => cc2
)

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