/**
 * 排列组合生成
 *
 * @param 
 * @arrange (512.笔记) jb51.cc
 **/
function permutations($letters,$num){ 
    $last = str_repeat($letters{0},$num); 
    $result = array(); 
    while($last != str_repeat(lastchar($letters),$num)){ 
        $result[] = $last; 
        $last = char_add($letters,$last,$num-1); 
    } 
    $result[] = $last; 
    return $result; 
} 
function char_add($digits,$string,$char){ 
    if($string{$char} <> lastchar($digits)){ 
        $string{$char} = $digits{strpos($digits,$string{$char})+1}; 
        return $string; 
    }else{ 
        $string = changeall($string,$digits{0},$char); 
        return char_add($digits,$char-1); 
    } 
} 
function lastchar($string){ 
    return $string{strlen($string)-1}; 
} 
function changeall($string,$char,$start = 0,$end = 0){ 
    if($end == 0) $end = strlen($string)-1; 
    for($i=$start;$i<=$end;$i++){ 
        $string{$i} = $char; 
    } 
    return $string; 
} 


//{!--To use this Generator you can do something like this : --}
$Array=permutations("ABC",3); 
for($i=0 ; $i < count($Array) ; $i++) { 
        echo "$i." . $Array[$i] . "<BR>"; 
} 



/***   代码来自编程之家 jb51.cc（jb51.cc）   ***/