PHP append one array to another

Given two array arr1 and arr2 and the task is to append one array to another array.

Examples:

Input : arr1 = [ 1, 2 ]
        arr2 = [ 3, 4 ]

Output : arr1 = [ 1, 2, 3, 4 ]

Input : arr1 = [ "Geeks", "g4g" ]
        arr2 = [ "GeeksforGeeks" ]

Output : arr1 = [ "Geeks", "g4g", "GeeksforGeeks" ]

Using array_merge function: This function returns a new array after merging the two arrays.

Example:

<?php
$arr1 = array("Geeks", "g4g");
$arr2 = array("GeeksforGeeks", "Computer science portal");

// Get the merged array in the first array itself.
$arr1 = array_merge($arr1, $arr2);

echo "arr1 Contents:";

// Use for each loop to print all the array elements.
foreach ($arr1 as $value) {
    echo $value . "\n";
}
?>

Output:

arr1 Contents:
Geeks
g4g
GeeksforGeeks
Computer science portal

Using array_push Method: This method pushes the second array element in the first array in-place.

Example:

<?php
$arr1 = array(1, 2);
$arr2 = array(3, 4);

// arr2 elements are being pushed in the arr1.
array_push($arr1 , ...$arr2);

echo "arr1 = ";

// Use for each loop to print all the array elements.
foreach ($arr1 as $value) {
echo $value . ' ';
}
?>

Output:

arr1 = 1 2 3 4

Note: Another way to do it is by ‘ + ‘ but it gives fatal warning in the newer versions, hence it is not recommended.