(PHP 4, PHP 5)
decoct — Decimal to octal
$number
    )
   Returns a string containing an octal representation of the given
   number argument.  The largest number that can be converted is
   4294967295 in decimal resulting to "37777777777". 
  
numberDecimal value to convert
   Octal string representation of number
  
Example #1 decoct() example
<?php
echo decoct(15) . "\n";
echo decoct(264);
?>
The above example will output:
17 410