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floor(argument)

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 Function   [other Function type actions]

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 Mathematical   [other Mathematical operators]

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floor(argument)

rounds the number value of argument down to next whole integer.

See also ceil() and round().

If $MyNumber is 3.9 then:

$MyNumber = ceil($MyNumber); 

sets $MyNumber to 3. Note unlike normal rounding the value is set downwards to the next integer (i.e. whole number).