如何用PHP删除最新的字符串？

Question

I want get first 50 characters and want end this with a word. So I get first 50 characters with $dis=substr($dis, 0, 50); And I don't know how can delete latest word.

My Text:

You will find that the truth is often unpopular and the contest between agreeable fancy and disagreeable fact is unequal.

First 50 characters:

"You will find that the truth is often unpopular an"

While First 51 characters:

"You will find that the truth is often unpopular and"

(First 50 characters) - (Latest word):

"You will find that the truth is often unpopular"

Answer 1

You can use the strrpos() function to find the last empty space in the string.

substr($dis, 0, strrpos($dis, " "));