Description:
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I have a variable saved as float (checked with var_dump) and if I pass that 
variable to "strtotime()", I get a valid timestamp. For example if my float 
variable is "0.8", I would get "1324249680" as result from strtotime.

Not sure if this is normal, but I would say NO.

Test script:
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echo strtotime(0.8);

$var = 0.8;
echo strtotime($var);

Expected result:
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FALSE

Actual result:
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1324249680