What is user_trailingslashit() for?

The trailingslashit() function adds a / to the end of a URL if it lacks one.

user_trailingslashit() uses the permalink template as set under Settings > Permalinks to decide whether to add or remove the trailing slash from the end of the URL

For example, if you had the permalink format set to /%year%/%monthnum%/%day%/%postname%/ (note the trailing slash), user_trailingslashit() would append a trailing slash to the URL passed in as the first parameter.

If the permalink format was /%year%/%monthnum%/%day%/%postname% (no trailing slash), any trailing slash on the URL would be stripped off.

Basically, user_trailingslashit() forces the URL to be consistent with what is set in the permalink preferences.

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