Php Spread Operator Examples

Php Spread Operator Examples

php spread operator examples

Spread Operator in Function Arguments

Example 1: Using Spread Operator in Function Calls

<?php
function sum($a, $b, $c) {
    return $a + $b + $c;
}

$numbers = [1, 2, 3];
echo sum(...$numbers);
?>

Output:

6

Spread Operator in Array Expressions with PHP 7.4 

Example 2: Merging Arrays

<?php
$array1 = [1, 2, 3];
$array2 = [4, 5, 6];

$mergedArray = [...$array1, ...$array2];
print_r($mergedArray);  
?>

Output:

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 )

Example 3: Adding Elements to an Array

<?php
$initial = [1, 2, 3];
$extended = [...$initial, 4, 5];
print_r($extended);  
?>

Output:

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 )

Combining Arrays Dynamically

Example 4: Combining Multiple Arrays

<?php
$arr1 = [1, 2, 3];
$arr2 = [4, 5];
$arr3 = [6, 7, 8];

$combined = [...$arr1, ...$arr2, ...$arr3];
print_r($combined);  
?>

Output:

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 )

Example 5: Passing an Array to a Variadic Function

<?php
function concatenate(...$strings) {
    return implode(' ', $strings);
}

$words = ['Hello', 'World', 'from', 'PHP'];
echo concatenate(...$words); 
?>

Output:

Hello World from PHP

Spread Operator with Traversable Objects

Example 6: Using Spread Operator with Traversable

<?php
class NumberGenerator implements IteratorAggregate {
    private $numbers;

    public function __construct($numbers) {
        $this->numbers = $numbers;
    }

    public function getIterator() {
        return new ArrayIterator($this->numbers);
    }
}

$generator = new NumberGenerator([1, 2, 3]);
$result = [...$generator];
print_r($result);  
// Output: Array ( [0] => 1 [1] => 2 [2] => 3 )
?>