Question about string replace -PHP

I have a script pulling in certain text from a site.  I want the script to then 
from that
retrieved text, to replace the incorrect domain with another domain.

What is a way that I can do that, I know the domain that its going to put in 
the script, and I
know the domain that I want to point it to.

Any help .. 


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dan mccullough
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"Theres no such thing as a problem unless the servers are on fire!"


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