How can I get a certain line from a file?

If I get a file in this way:

$f = fopen("http://www.url.com/index.htm","r";); 

How can I get a certain line of the file index.htm?

I would need to get the line number 232, or lines from 232 to 238. How can I get this 
content?

Thanx.

Rodrigo

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