How to Conditionally Add Elements to an Array in PHP 8.1?

Adding Conditional Associative Elements to Array in PHP

When manipulating arrays in PHP, you may encounter scenarios where adding a specific element depends on certain conditions. For instance, you may want to include an element with a specific key and value only if a particular condition evaluates to true.

Original Problem:

Consider the following array:

You want to conditionally add a new element with the key 'b' and value 'xyz' to this array using the array() statement. However, the ternary operator does not allow for such conditional additions.

Solution in PHP 8.1:

With the advent of PHP 8.1, you can achieve this conditional element addition using array unpacking:

This syntax allows you to unpack an array within an existing array based on the evaluation of a condition. In this case, if $condition is true, the array ['baz' => 'boo'] will be merged into $arr. Otherwise, it will be skipped.

This solution leverages the new spread operator (...) introduced in PHP 8.1, which enables unpacking sequences (including arrays) in various contexts.

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