How to replace array values with another array’s values in PHP?

In this tutorial, you will learn how to replace array values with another array’s values in PHP.

PHP has two inbuilt array functions – array_replace(), and array_replace_recursive(). With the help of these two functions, you can replace array values with another array’s values.

1. PHP array_replace() function

array_replace(array1, array2, array3, ...)
  • The PHP array_replace() function only works with numeric and associative arrays.
  • It takes multiple parameters, and all the parameters must be an array. The first parameter is required, the others are optional.
  • It replaces the values of the first array (array1) with the values from other given arrays.
  • This function returns a new array with the replaced values, it does not affect the original array.
<?php
$array1 = [1, 2, 3, 4, 5];
$array2 = [10, 12];

$newArray = array_replace($array1, $array2);

echo "<pre>";
print_r($newArray);
echo "</pre>";
Array
(
    [0] => 10
    [1] => 12
    [2] => 3
    [3] => 4
    [4] => 5
)
Another Example
<?php
$array1 = ['Apple', 'Banana', 'Orange', 'Mango'];
$array2 = ['Pineapple', 'Strawberry'];
$array3 = ['Watermelon', 'Pear', 'Lychee'];


$newArray = array_replace($array1, $array2, $array3);

echo "<pre>";
print_r($newArray);
echo "</pre>";
Array
(
    [0] => Watermelon
    [1] => Pear
    [2] => Lychee
    [3] => Mango
)

2. PHP array_replace_recursive() function

PHP array_replace() doesn’t work with multidimensional arrays, in this case you can use the array_replace_recursive() function.

This function works similar to the array_replace() function, except in the above case.

<?php
$array1 = [['Avocado', 'Apple'], 'Orange', ['Mango', 'Lemon']];
$array2 = [['Banana'], 'Watermelon', ['Lychee', 'Guava', 'Grapes']];


$newArray = array_replace_recursive($array1, $array2);

echo "<pre>";
print_r($newArray);
echo "</pre>";
Array
(
    [0] => Array
        (
            [0] => Banana
            [1] => Apple
        )

    [1] => Watermelon
    [2] => Array
        (
            [0] => Lychee
            [1] => Guava
            [2] => Grapes
        )

)

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