(PHP 4, PHP 5)
floor — Round fractions down
   Returns the next lowest integer value (as float) by rounding down
   value if necessary. 
  
valueThe numeric value to round
   value rounded to the next lowest integer.
   The return value of floor() is still of type
   float because the value range of float is 
   usually bigger than that of integer. This function returns FALSE in case of an error (e.g. passing an array).
  
Example #1 floor() example
<?php
echo floor(4.3);   // 4
echo floor(9.999); // 9
echo floor(-3.14); // -4
?>