PHP rtrim（）或类似的函数，用于从字符串中删除X个字符

Question

This should be pretty basic. I've searched all over the best matching function (as far as I can see from PHP Manual is rtrim)

I've got a string. I want to remove X-amount of characters from, specifically the first 4 characters from the string.

EXAMPLE:

Fri, Dec 1, 2017

Sat, Dec 2, 2017

Sat, Dec 2, 2017

I would like to remove the first 4 characters from the left including white space after comma in order for me to have a date I can work with without day of week.

Now according to manual and W3Schools rtrim() enables you to do the above. However as I understand it, you have to put in the characters / text you want to be trimmed from string.

My problem is the days of the week will alternate from MON - SUN thus I can not put specific characters.

I'm trying to trim with index numbers starting from left 0-4

So at the end:

Fri, Dec 1, 2017

Should read

Dec 1, 2017

Answer 1

尝试;

substr("Fri, Dec 1, 2017", 5);