How PHP uses Array_merge to rearrange array subscripts _php tips

This example describes how PHP uses Array_merge to rearrange the array subscripts. Share to everyone for your reference. Specifically as follows:

Using a array_unique to remove the duplicates inside an array, but found that the subscript retains the subscript of the original array, but PHP uses a for loop that needs to be labeled neatly, so looking for a way to rearrange the subscripts of the array array_merge can solve this problem

The Array_merge () function merges two or more arrays into an array.

If the key name is duplicated, the key value of the key is the value of the last key name (preceded by the overlay). If the array is a numeric index, the key name is sequentially indexed.

Note: If you simply enter an array to the Array_merge () function and the key is an integer, the function returns a new array with the integer key name, whose key name is indexed in 0. (see Example 2)

Grammar:

Array_merge (Array1,array2,array3 ...)

Parameters	Description
Array1	Necessary. The first array entered.
Array2	Necessary. The second array entered.
Array3	Optional. Multiple input arrays that can be specified.

Example 1

<?php
$a 1=array ("a" => "horse", "B" => "Dog");
$a 2=array ("C" => "Cow", "B" => "Cat");
Print_r (Array_merge ($a 1, $a 2));
? >

Output:

Array ([a] => horse [b] => Cat [c] => Cow)

Example 2

Use only one array parameter:

<?php
$a =array (3=> "horse",4=> "Dog");
Print_r (Array_merge ($a));
>

Output:

Array ([0] => horse [1] => Dog)

I hope this article will help you with your PHP program design.