>> Is there a possibility to convert a string like "10*500" (parsed from a
>> XML-File) to a float? When i try to store this String in a float
>> variable it only coverts the "10" but nothing after the "*"-sign, but i
>> need the result of this expresison... Is there a function to calculate
>> such string expressions?
Another possibility is to pipe the expression to bc, which could do the
input check for you, and probably covers a lot of syntactic ground.
Slightly less resource-efficient, but you don't have to reinvent the
wheel (untested, unix only):
$result = shell_exec("echo '${expr}' | bc");
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sf/ca http://mike.teczno.com/contact.html
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