Add Str::start() and str_start helper function

[calebporzio]

What's life if you can't PR string helper functions - amiright?

With some naming help from twitter and @adamwathan, I planned on PRing str_prefix and str_suffix (Those were the helper functions @DanielCoulbourne and I talked about on the podcast) as a cure for the common and gnarly looking ltrim($path, '/').'/' and rtrim($path, '/').'/', but upon writing up tests discovered str_finish face palm

I often need this sort of thing when dealing with urls and paths. Hopefully the need is felt.

Long live the string helper!

[taylorotwell]

I accept your string helper offering.

[DanielCoulbourne]

Proud of you bud.

[adamwathan]

Should benchmark the regex implementation in this and finish; makes sense to replicate the finish implementation but I can't help but think it's total overkill in both situations vs. ltrim and rtrim.

If the code was significantly simpler with the regex I wouldn't even say anything, but actually feels more complicated than this:

return $prefix.ltrim($value, $prefix);

Maybe there's some other reason it needs to be fancy though? Entirely possible!

(FWIW I would have PR'd it the exact same way you did, to be clear 😄)

[wilburpowery]

The helper man. Congrats @calebporzio 👌🏻

[vlakoff]

@adamwathan The trim methods work on single chars (the string is a "mask").

e.g. trim('foobar', 'afr') returns oob