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BioPHP - Factorial

Original code submitted by joseba
Code bellow is covered by GNU GPL v2 license.

Description

Last change: 2010/10/18 17:04 | Edit description | Recent Changes | Original description

Computes factorial of number

Code

Last change: 2010/10/18 17:04 | Edit Code | Recent Changes | Download | Original code

function factorial( $x ) {
  $tmp = 1;

  if( $x == 0 ) {
    $tmp = 1;
  } 
  else if( $x < 0 ) {
    return -1;
  }
  else {
    for( $i=1; $i < $x+1; $i++ ) {
      $tmp *= $i;
    }
  }

  return $tmp;
}