Php4/Mysql and character encoding

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My website is blog/news aggregator. It reads rss and atom feeds to store  
and stores data in a mysql database. The feeds may use different  
character encodings, generally utf-8 and iso-8859-1. The parsing script  
knows from the database when it visits a utf-8 feed and uses the php  
function utf8_decode before send information to mysql. This has been  
working great for five month.
Without any noticeable change in the configuration or in the scripts, it  
started to convert iso-8859-1 to utf-8 before sending the data to mysql,  
which doesn't undestand unicode, so texts with accentuated characters  
become unreadable.
Is it possible that the encoding of the php files cause such behaviour ?  
Can you think of any other reason or solution ? Any help will be  

Thanks in advance.


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