Using PHP array_merge() to Combine Multiple Arrays

PHP provides many powerful functions for handling arrays, and one of the most useful is array_merge(), which merges one or more arrays into a new array and returns the result.

The syntax of array_merge() is straightforward:

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

The function accepts multiple arrays as arguments and returns a single combined array.

Below are several example codes demonstrating how to use array_merge():

Example 1: Merging Two Arrays

$array1 = array('apple', 'banana', 'orange');
$array2 = array('kiwi', 'melon', 'grape');
$result = array_merge($array1, $array2);
print_r($result);

Output:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
    [3] => kiwi
    [4] => melon
    [5] => grape
)

In this example, the two arrays $array1 and $array2 are combined into a new array $result, which contains all elements from both original arrays.

Example 2: Merging Multiple Arrays

$array1 = array('apple', 'banana', 'orange');
$array2 = array('kiwi', 'melon', 'grape');
$array3 = array('strawberry', 'pineapple');
$result = array_merge($array1, $array2, $array3);
print_r($result);

Output:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
    [3] => kiwi
    [4] => melon
    [5] => grape
    [6] => strawberry
    [7] => pineapple
)

This example shows that any number of arrays can be merged; the resulting array contains all elements in the order they were provided.

Example 3: Merging Associative Arrays

$array1 = array('name' => 'John', 'age' => 25);
$array2 = array('name' => 'Jane', 'email' => '[email protected]');
$result = array_merge($array1, $array2);
print_r($result);

Output:

Array
(
    [name] => Jane
    [age] => 25
    [email] => [email protected]
)

When merging associative arrays, if the same key appears in multiple arrays, the value from the later array overwrites earlier ones; thus the key name ends up with the value Jane in the result.

Summary

The array_merge() function is a versatile tool for combining both indexed and associative arrays in PHP. It simplifies data handling by allowing developers to merge any number of arrays into a single, cohesive structure.

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