How Can I Conditionally Add Elements to an Array in PHP 8.1 Using Array Unpacking?

Conditional Element Addition in Array via Array Unpacking

In PHP, conditionally adding elements to an array using the array() statement can be a bit tricky when using the ternary operator. However, PHP 8.1 introduces a solution using array unpacking.

To conditionally add the element 'b' => 'xyz' to the array $arr = array('a' => 'abc'), you can use the following syntax:

$arr = [
    'foo' => 'bar', 
    ...($condition ? ['baz' => 'boo' ] : []),
];

In this example, the variable $condition determines whether the element 'baz' => 'boo' should be added to the array. If $condition is true, the element is added; otherwise, it is omitted.

Array unpacking allows you to expand an array into a set of individual values or expressions. Here, the ternary operator returns either an array containing 'baz' => 'boo' or an empty array. The spread operator (...) then unpacks this array, potentially adding its elements to $arr.

This approach provides a concise and efficient way to conditionally add elements to an array, particularly when working with large or complex arrays. It simplifies the code and avoids the limitations of the ternary operator.

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