删除字符串的最后一个字符，如果它是$ variable

Question

I've made a little script to convert titles into url friendly things.

ie:

'I am a title'

becomes

'I_am_a_title'

My script basically goes through and turns spaces, apostrophes, commas etc etc into an underscore.

The problem is, sometimes my url's end up like this:

'i_am_a_title_'

with a trailing underscore...

So i figure, add a little bit to go through and search to see if the last character is an underscore on the final result, and if it is, then swap it.

I looked into the strrchr() function but I seem to be hitting a wall of my own understanding.

How is this sort of thing accomplished?

Answer 1

PHP's trim() function will do what you need it to, on both sides of the string:

$slug = trim($slug, '_');

You could even run this before changing special characters to underscores if you wanted to, as the function can handle trimming multiple different characters off.