PHP function introduction: array_merge() function

Introduction to PHP functions: array_merge() function, specific code examples are required

PHP is a powerful programming language, it has countless built-in functions, in the function library Each function has its own unique purpose and effect. This article will introduce a very commonly used function in PHP, which is the array_merge() function.

The array_merge() function is a function used to merge two or more arrays. It merges the elements of two or more arrays into one array and returns a new array.

When using the array_merge() function, you need to pay attention to the specific usage of some parameters. Let us take a look at the syntax of the array_merge() function:

Syntax:

array_merge ( array $array1 [, array $... ] ) : array

array_merge() function parameters:

• array1: required, Merge the first array into the new array.
• …: Optional, you can add multiple parameters to other arrays to be merged into the new array.

array_merge() function return value:

• Returns all elements in the array, including repeated elements. If two or more arrays have the same key, the later key will overwrite the earlier key.

Next, we will introduce the use of array_merge() function through a simple PHP code example.

Code Example:

First, let us create two arrays as the two parameters of the array_merge() function and pass them to the function for merging.

<?php
   $array1 = array('A'=>'Apple','B'=>'Ball','C'=>'Cat');
   $array2 = array('D'=>'Dog','E'=>'Egg','F'=>'Fan');

   $result = array_merge($array1, $array2);
   print_r($result);
?>

In the above code, we first define two arrays: $array1 and $array2, which are used to store some different string values. Next, we use the array_merge() function to merge the two arrays and store the result in the $result variable. Finally, we use the print_r() function to print out the merged results.

When we run the above code, we will get the following output:

Array
(
    [A] => Apple
    [B] => Ball
    [C] => Cat
    [D] => Dog
    [E] => Egg
    [F] => Fan
)

As can be seen from the above output, the two arrays have been successfully merged into a new array , and no duplicate elements appear.

In addition to the examples shown above, the array_merge() function can also be used to merge multiple arrays. You only need to pass multiple arrays as parameters of the array_merge() function. In addition, when the same key appears in the array, the later key will overwrite the previous key.

Whether you are developing web applications or other types of applications, the array_merge() function is undoubtedly a very practical and efficient tool. I hope the introduction in this article can help you better use the array_merge() function to process elements in arrays.

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