Use array_first() to get the first array element

[Soean]

Now that array_first() (added in PHP 8.5, polyfilled in wp-includes/compat.php via #63853) is available in core, a few spots can be simplified to use it directly instead of the older array_values( ... )[0] / array_slice( ..., 0, 1 )[0] constructs. This improves readability without changing behavior.

Replace array_values( ... )[0] and array_slice( ..., 0, 1 )[0] constructs with the array_first() function (added in PHP 8.5, polyfilled in compat.php) for improved readability.

Trac ticket: https://core.trac.wordpress.org/ticket/65598

Trac link: https://core.trac.wordpress.org/ticket/65598

Replace array_values( ... )[0] and array_slice( ..., 0, 1 )[0] constructs with the array_first() function (added in PHP 8.5, polyfilled in compat.php) for improved readability.

Trac link: https://core.trac.wordpress.org/ticket/65598

Replace array_values( ... )[0] and array_slice( ..., 0, 1 )[0] constructs with the array_first() function (added in PHP 8.5, polyfilled in compat.php) for improved readability.

[SergeyBiryukov]

In 62695:

Coding Standards: Use array_first() to get the first array element.

This replaces array_values( ... )[0] and array_slice( ..., 0, 1 )[0] constructs with the array_first() function added in PHP 8.5 for improved readability.

WordPress core includes a polyfill for array_first() on PHP < 8.5 as of WordPress 6.9, so the change works on every supported PHP version without raising the minimum requirement.

Follow-up to [9685], [50995], [60672].

Props Soean, mukesh27.
See #65598.

Comitted in ​https://github.com/WordPress/wordpress-develop/commit/64d4a6d6f3eb9dee2bf706fae669590eb68c9b89