Description:
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Passing variables like e.g. urls which contain a + char in filenames or simple math questions like 1+1 is not possible because vars are urldecoded before they are passed on within php. A "+" in the variable is always "decoded" to space, which makes it impossible to take user input like not encoded urls or math questions directly but requires parsing by hand from querystring.

Reproduce code:
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print $_SERVER['QUERY_STRING']."<BR>";
print $_GET['var']."<BR>";
print $var;

called with ..script.php?var=1+1 (register_globals on)


Expected result:
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var=1+1
1+1
1+1

Actual result:
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var=1+1
1 1
1 1