Detailed explanation of example of merging 2 numeric key array values ​​in PHP

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

The example describes a simple method of merging two numeric key array values ​​in PHP. Share it with everyone for your reference, the details are as follows:

You must first understand a basic knowledge point: Analysis of the difference between PHP merging array + 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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