Description:
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Someone defined octal numbers are prefixed with a 0 but there is no mathematical theory that says a number with one or more 0 in front is not a number. When we now use filter_var to filter user input we have to tell the user that a number with 0 in front is not an integer. Or we use a more generic way like reg exp /^\d+$/ but I thought the filter_var is made for this propose.

Currently the problem is that users enter minutes and seconds with zeroes in front. It should indeed not be a float so to filter for integer is correct.

Test script:
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var_dump(filter_var('03', FILTER_VALIDATE_INT));
var_dump(filter_var('+08', FILTER_VALIDATE_INT));
var_dump(filter_var('-010', FILTER_VALIDATE_INT));

Expected result:
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int(3)
int(8)
int(-10)

Actual result:
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false
false
false