(PHP 4, PHP 5, PHP 7)
decoct — Decimal to octal
$number
    )
   Returns a string containing an octal representation of the given
   number argument. The largest number that can be
   converted depends on the platform in use. For 32-bit platforms this is
   usually 4294967295 in decimal resulting in
   37777777777. For 64-bit platforms this is usually
   9223372036854775807 in decimal resulting in
   777777777777777777777.
  
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