what is the symbol that looks like space, but not a space? (not a )

问题

I'm talking NOT about   but about another symbol " " that looks like " " even in text area, but that's another symbol (splitting the string by space symbol does NOT split "hello world" into two words).

回答1:

  or one of those below maybe?

http://www.w3.org/TR/html4/sgml/entities.html

<!-- General Punctuation -->
<!ENTITY ensp    CDATA "&#8194;" -- en space, U+2002 ISOpub -->
<!ENTITY emsp    CDATA "&#8195;" -- em space, U+2003 ISOpub -->
<!ENTITY thinsp  CDATA "&#8201;" -- thin space, U+2009 ISOpub -->

回答2:

in the old time of DOS, char 255 was a blank character

回答3:

You may have a look at Unicode whitespace characters, because there are plenty of them

回答4:

just echo your string contains whatever special characters using rawurlencode() function:

echo rawurlencode("whatever string with any \05 \02 weird symbols");

and see their codes preceded with % sign

来源：https://stackoverflow.com/questions/10319539/what-is-the-symbol-that-looks-like-space-but-not-a-space-not-a-nbsp