逻辑 菜鸟 简单的
我是想实现62进制的功能，可是下面这段代码只能echo出来，不能返回，不知道是什么原因，求高手解答
function dwz($id,$str=""){ $a=array("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"); $zs=(int)($id/sizeof($a)); $xs=$id%sizeof($a); if($zs>=sizeof($a)){ $str=$a[$xs].$str; dwz($zs,$str); } else{ if($str==""){ return $a[$zs].$a[$xs]; } else{ echo $a[$zs].$str;//这里只能输出 return $a[$zs].$str;//返回没值，不知道什么原因 } }}for($i=999990;$i<=1000000;$i++){ echo dwz($i); echo "<br>";} 第7行 dwz($zs,$str);
没有承接返回
$str = dwz($zs,$str);
函数结束处还需要有 return $str;
if($zs>=sizeof($a)){ $str=$a[$xs].$str; dwz($zs,$str); //这里加入return： return dwz($zs, $str); } 第7行 dwz($zs,$str);
没有承接返回
$str = dwz($zs,$str);
函数结束处还需要有 return $str;
哈哈，可以啦，谢谢你的提醒和指导
这样写也可以，可逆的前不限长度
echo convert_62(999990); //4C8secho convert_62('4C8s', 1); //999990function convert_62($s, $mode=0) { $d = str_split('0123456789ABCDEFGHIJKLMNOPQRSTUVEXYZabcdefghijklmnopqrstuvwxyz'); $r = ''; if($mode) { $d = array_flip($d); for($i=0; $i<strlen($s); $i++) $r = bcmul($r, '62') + $d[$s{$i}]; }else { while($s) { $r = $d[bcmod($s, '62')] . $r; $s = bcdiv($s, '62'); } } return $r;}这样写也可以，可逆的前不限长度
echo convert_62(999990); //4C8secho convert_62('4C8s', 1); //999990function convert_62($s, $mode=0) { $d = str_split('0123456789ABCDEFGHIJKLMNOPQRSTUVEXYZabcdefghijklmnopqrstuvwxyz'); $r = ''; if($mode) { $d = array_flip($d); for($i=0; $i<strlen($s); $i++) $r = bcmul($r, '62') + $d[$s{$i}]; }else { while($s) { $r = $d[bcmod($s, '62')] . $r; $s = bcdiv($s, '62'); } } return $r;}这样写也可以，可逆的前不限长度
echo convert_62(999990); //4C8secho convert_62('4C8s', 1); //999990function convert_62($s, $mode=0) { $d = str_split('0123456789ABCDEFGHIJKLMNOPQRSTUVEXYZabcdefghijklmnopqrstuvwxyz'); $r = ''; if($mode) { $d = array_flip($d); for($i=0; $i<strlen($s); $i++) $r = bcmul($r, '62') + $d[$s{$i}]; }else { while($s) { $r = $d[bcmod($s, '62')] . $r; $s = bcdiv($s, '62'); } } return $r;} 嗯，这是 php_bc 扩展没加载的原因（php for win 是自动加载的）
你还可以检查一下 php_gmp 扩展是否已加载，用这个函数库也是一样的
嗯，这是 php_bc 扩展没加载的原因（php for win 是自动加载的）
你还可以检查一下 php_gmp 扩展是否已加载，用这个函数库也是一样的
真的没有加载，那怎么办啊？
我没服务器的权限
print_r(get_loaded_extensions());
看看都有些什么
print_r(get_loaded_extensions());
看看都有些什么
Array( [0] => date [1] => libxml [2] => openssl [3] => pcre [4] => zlib [5] => ctype [6] => curl [7] => dom [8] => filter [9] => ftp [10] => gd [11] => hash [12] => iconv [13] => json [14] => mbstring [15] => mcrypt [16] => mhash [17] => mysql [18] => SimpleXML [19] => SPL [20] => PDO [21] => posix [22] => Reflection [23] => session [24] => pdo_sqlite [25] => sockets [26] => SQLite [27] => standard [28] => tokenizer [29] => xml [30] => xmlreader [31] => xmlwriter [32] => zip [33] => apache2handler [34] => memcache [35] => mssql [36] => soap [37] => Zend Optimizer)
没权限就不好办了
就自己写吧，你不是也写了吗
没权限就不好办了
就自己写吧，你不是也写了吗
我写的那个有错，发现运算到后面就错了，然后就用了你的
还是没搞清楚我的那个错在哪里，为什么运算到后面就错了
大神，帮忙看下吧
function dwz($id,$str=""){$a=array("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"); $zs=(int)($id/sizeof($a)); $xs=$id%sizeof($a); if($zs>=sizeof($a)){ $str=$a[$xs].$str; $str=dwz($zs,$str); } else{ if($str==""){return $a[$zs].$a[$xs];} else{return $a[$zs].$str;} } return $str;} 终于可以了，谢谢大神
function dwz($s) { $d = str_split('0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVEXYZ'); $r = ''; while($s) { $r = $d[(int)($s%62)].$r; $s = (int)($s/62); } return $r;}
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