Rookie ask a simple logic question, seek answers

Logic rookie, simple.

I want to achieve 62 of the functionality of the system, but the following code can only echo out, can not return, do not know what is the reason, seek expert answers

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); ($zs >=sizeof ($a)) {$str = $a [$xs]. $str;d wz ($zs, $str);} Else{if ($str = = "") {return $a [$zs]. $a [$xs];} Else{echo   $a [$zs]. $str;//This can only output return $a [$zs]. $str;//Return no value, do not know what reason}}}for ($i =999990; $i <=1000000; $i + +) {Echo DWZ ($i); echo "
";}

Reply to discussion (solution)

Line 7th DWZ ($zs, $STR);
did not undertake to return
$str = DWZ ($zs, $STR);

Return $STR is also required at the end of the function;

    if ($zs >=sizeof ($a)) {         $str = $a [$xs]. $str;         DWZ ($zs, $STR); Join Return:return DWZ here ($zs, $STR);    

Line 7th DWZ ($zs, $STR);
did not undertake to return
$str = DWZ ($zs, $STR);

Return $STR is also required at the end of the function;

Haha, yes, thank you for your reminding and guidance.

This can also be written, reversible front unlimited length

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
  
  
 
  
This can also be written, reversible front unlimited length

  
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
     
    
Thanks, thank you.
    
 
    
This can also be written, reversible front unlimited length

    
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
       
      
  
      
Excuse me, I ask why I put this file in the local test can be used, but placed on the server is not available, will be prompted to find bcmod this function
      
 
      
Well, this is why the PHP_BC extension is not loaded (PHP for win is automatically loaded)
You can also check to see if the PHP_GMP extension is loaded, as is the case with this library.
 
      
Well, this is why the PHP_BC extension is not loaded (PHP for win is automatically loaded)
You can also check to see if the PHP_GMP extension is loaded, as is the case with this library.
  
Really did not load, then how to do?
I don't have permissions on the server.
 
      
Print_r (Get_loaded_extensions ());
Let's see what we got.
 
      
Print_r (Get_loaded_extensions ());
Let's see what we got.
  
  

      
Array (    [0] = date    [1] = Libxml    [2] = = OpenSSL    [3] = Pcre    [4] = Zlib    [5] = C Type    [6] = Curl    [7] = Dom    [8] = + Filter    [9] = FTP    [ten] = GD    [one] = hash
        [12] = Iconv    [+] + JSON    [+] = mbstring    [[] = MCrypt    [+] = Mhash    [17 ] = MySQL [+    ]-SimpleXML    [[+] = SPL    [] = PDO    [+] = POSIX    [] = REFL ection [[] = [[]] = [+]    = pdo_sqlite [+] = sockets [+    ]    = SQLite [27] = > Standard    [tokenizer] + = [+] +    XML [+]    = XmlReader    [+] = XmlWriter    [ [+] = Zip    [+] = Apache2handler [+]    = memcache    [+] = MSSQL    [+] = Soap    [ PNS] = Zend Optimizer)
 
      
 
      
It's hard to do without permission.
Just write it yourself, didn't you?
 
      
It's hard to do without permission.
Just write it yourself, didn't you?
  
I wrote that mistake, found that the operation is wrong on the back, and then use your
Still can't figure out where my mistake is, why it's wrong to do it in the back
God, help me see it.
 
      
  

      
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); ($zs >=sizeof ($a)) {$str = $a [$xs]. $str; $str =dwz ($zs, $str);} Else{if ($str = = "") {return $a [$zs]. $a [$xs];} Else{return $a [$zs]. $str;}} return $STR;}
  
      
  
      
This is I based on your tips to change, can be displayed, but my previous algorithm is wrong, help to see
      
 
      
Finally, thank you, great God.
  

      
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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