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Bug #7934 HTTP_POST_VARS unable to handle same key multiple times
Submitted: 2000-11-22 17:03 UTC Modified: 2002-09-12 09:29 UTC
From: bzeeb+php at zabbadoz dot net Assigned:
Status: Closed Package: Variables related
PHP Version: 4.0.3 OS: FreeBSD
Private report: No CVE-ID: None
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 [2000-11-22 17:03 UTC] bzeeb+php at zabbadoz dot net 
Using p.ex. function from FAQ 7.1 to read HTTP_POST_VARS one
is unable to handle/see all key-value-pairs when key is the same for
multiple values. I did not find any way to see all pairs (well one might define an array as name but that is not what CGI standard expects I think).

p.ex. having something like this in a HTML form:

<input type=checkbox name="FORM_key" value="2">
<input type=checkbox name="FORM_key" value="8">
<input type=checkbox name="FORM_key" value="19">

would only result in:

FORM_key -> 19
sizeof($HTTP_POST_VRS) = 1

instead of

FORM_key -> 2
FORM_key -> 8
FORM_key -> 19
where sizeof would return 3.

This is most likely caused by using some kind of associative array instead
of using indexes. I did not manage to solve this by using other array f()s.
I do not have time to look at the source code - sorry.
A simple dirty quick hack perl-script shows you that one does get all the
three values:

--- snipp ---
#!/usr/bin/perl

printf("Content-Type: text/html\n\n");

if ($ENV{'CONTENT_LENGTH'} > 0) {
    read(STDIN, $buffer, $ENV{'CONTENT_LENGTH'});

    @pairs = split(/&/, $buffer);

    printf("\nPOST-Buffer (raw):<br>\n");
    printf("%s\n", $buffer);
    printf("\nPOST-Buffer (split up):<br>\n");

    foreach $pair (@pairs) {
            printf("%s<br>\n", $pair);
    }
} else {
        printf("NO HTTP_POST_VARs -> nothing to do here<br>\n");
}

# End;
--- snipp ---

Patches

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 [2000-11-23 05:25 UTC] sniper@php.net 
Just add [] to the name. i.e. 

<input type="checkbox" name="FORM_key[]" value="2">

--Jani
 [2002-07-18 09:52 UTC] chrisrivera at chrisrivera dot com 
Why is it that the '[]' is needed in the name attribute? Isn't this considered a bug then? Looping through the vars should return that it is an Array by default without the need of adding '[]' to the name attribute. This seems to be more of a hack than a solution.
 [2002-07-30 09:31 UTC] olivierdsm at hotmail dot com 
This is what i codded :
<input type="checkbox" name="inmailtoupdate[]" value="<? echo $row['admins_id']; ?>">


then :
  $SQL = "update admins set admins_inmail='yes' where admins_id in ($inmailtoupdate)";

--> this is what i get as error message : "Unknown column 'Array' in 'where clause'


so, ok i can write something like echo inmailtoupdate[1], but how do i get the complette list???
 [2002-07-30 11:52 UTC] hholzgra@php.net 
to chrisrivera@chrisrivera.com:

by giving the [] you specify that you *want*
an array while creating one auto-magicaly
whenever multiple values exists may confuse
form processing code as input variables may
be string or array depending on number of
selections made


to olivierdsm@hotmail.com:

this will do the trick for you:
"... IN (".join(",",$inmailtoupdate).") "
(but make sure $inmailtoupdate is not empty() before you do so)

please direct further questions to the php-general mailing list as we are no longer talking about bugs here
 [2002-09-05 16:59 UTC] dyonn at sympatico dot ca 
Correct me if I'm wrong, but I actually think this is a bug because adding [] to the NAME of the checkbox makes the object to be unaccessible throught javascript(or really hard to access).

document.myform.mycheckbox[].lenght will give syntax error.

I browsed quite a lot on the net and I havent found the way to play with a JS variable named something[]
 [2002-09-05 17:25 UTC] rasmus@php.net 
Every JS element has a numerical index number.  You do not have to use the name at all which allows you to call things whatever you want.
 [2002-09-12 08:22 UTC] m dot ford at lmu dot ac dot uk 
Or you can use the feature of JavaScript that, *by* *definition*

    a.b

is identical to

    a['b']

so you could refer to

    document.myform['mycheckbox[]'].length
 [2002-09-12 09:29 UTC] bzeeb+php at zabbadoz dot net 
please STOP this discussion here.
This bug-ID is _Closed_.

Either reopen or use a mailinglist...
 
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