New function: human_readable_duration

In WordPress 5.1, the new human_readable_duration function will be introduced. This function accepts a duration in hours, minutes and seconds and returns a “human readable” string appropriate for screen readers.

The function takes a string representing a time duration, with hours, minutes and seconds separated by a : (colon). For example, calling human_readable_duration( '3:10' ); will return 3 minutes, 10 seconds. Minutes and seconds are required. For 10 seconds, the call would be human_readable_duration( '0:10' );.

This new function was added as part of the work to improve the display of media metadata in #39667 where, in addition to adding units, aria-labels with plain language descriptions were added to improve accessibilityAccessibility Accessibility (commonly shortened to a11y) refers to the design of products, devices, services, or environments for people with disabilities. The concept of accessible design ensures both “direct access” (i.e. unassisted) and “indirect access” meaning compatibility with a person’s assistive technology (for example, computer screen readers). (
Improved time duration accessibility in the media library using the human_readable_duration() function.

#5-1, #dev-notes