PHP uses Array_merge to rearrange array subscript methods, Array_merge array _php tutorial

PHP uses Array_merge to rearrange array subscript methods, Array_merge array

This example describes how PHP rearranges array subscripts using Array_merge. Share to everyone for your reference. Specific as follows:

A array_unique was used to remove the repetition of an array, but the subscript was found to retain the subscript of the original array, but PHP uses a for loop to order the subscript neatly, so looking for a way to rearrange the array subscript 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's key value is the value corresponding to the last key name (followed by overwriting the previous one). If the array is a numeric index, the key name is re-indexed in a sequential manner.

Note: If you only enter an array into the Array_merge () function and the key name is an integer, the function returns a new array with an integer key name, with the key name re-indexed starting at 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$a1=array ("A" = "Horse", "b" = "Dog"), $a 2=array ("c" = "Cow", "B" and "Cat");p Rint_r (Array_merge ($ A1, $a 2));? >

Output:

Array ([A] = Horse [b] = Cat [c] = Cow)

Example 2

Use only one array parameter:

<?php$a=array (3=> "Horse",4=> "Dog");p Rint_r (Array_merge ($a));? >

Output:

Array ([0] = Horse [1] = Dog)

I hope this article is helpful to everyone's PHP programming.

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