Description:
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utf8 encoded page, send <input type=text name=foo, if you input ferienh?user and use array = explode(" ",$_REQUEST["foo"]) on that variable you get an array with echo $array[0] displayed in the browser source as ferienh??user instead of ferienhÀuser.

echo $_REQUEST["foo"]; displays correctly

Same happens if string submitted is "ferienh?user region" so it is not due to the lack of a space in the string.

using php5 compiled with latest apache and mysql-support on suse linux 9.0.

Reproduce code:
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<input type=text name=foo value=''>
if($_REQUEST["foo"] != ""){$array = explode(" ",$foo)}

Expected result:
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in_array("ferienh?user",$array) == true;

Actual result:
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As described above in_array does not find the keyword and all browsers do not display $array[0] correctly, although they do for $_REQUEST["foo"]

Reason, string gets corrupted.