Weird result?? php 4.4.0

[Bob Stearns]

I have a variable v with the value -1. After v++ it has the value "" not
0. Since I am using it for a subscript, the "" value is not overwriting
the 0 element of the array as desired. Should v++ ever give a
non-numeric value?

[Andy Hassall]

On Thu, 27 Jul 2006 17:47:50 -0400, Bob Stearns <rs**********@charter.net>
wrote:

>I have a variable v with the value -1. After v++ it has the value "" not
0. Since I am using it for a subscript, the "" value is not overwriting
the 0 element of the array as desired. Should v++ ever give a
non-numeric value?

No - post a script and output demonstrating this?

Since you're not on the latest release of a branch the standard advice would
be "upgrade", though, if this actually happens.

--
Andy Hassall :: an**@andyh.co.uk :: http://www.andyh.co.uk
http://www.andyhsoftware.co.uk/space :: disk and FTP usage analysis tool

[PTM]

"Bob Stearns" <rs**********@charter.netwrote in message
news:bw****************@fe04.lga...

>I have a variable v with the value -1. After v++ it has the value "" not 0.
Since I am using it for a subscript, the "" value is not overwriting the 0
element of the array as desired. Should v++ ever give a non-numeric value?

I used to use a variable initialised with -1, and never noticed the problem
you are having.
What are you trying to do with it and have you got an example of the code so
we can see what's going on?

Phil

[Bob Stearns]

Andy Hassall wrote:

On Thu, 27 Jul 2006 17:47:50 -0400, Bob Stearns <rs**********@charter.net>
wrote:

>>I have a variable v with the value -1. After v++ it has the value "" not
0. Since I am using it for a subscript, the "" value is not overwriting
the 0 element of the array as desired. Should v++ ever give a
non-numeric value?

No - post a script and output demonstrating this?

Since you're not on the latest release of a branch the standard advice would
be "upgrade", though, if this actually happens.

Here is a script fragment and the debugging output therefrom:

dosql($sql, "S AUI 3", -1, "", $res, $n);
$debug .= "<br>stk_ptr=$stk_ptr; ";
while($x=odbc_fetch_array($res)) {
$debug .= "<br>x="; debug_var($x); $debug .= "<br>";
$item_list[$n_animals] = $x["ITEM_ID"];
$free = $x["FREE_PART"];
$free_list[$n_animals] = $free;
if($free!="Y") $chg_animals++;
$n_animals++;
$stk_ptr++;
$stack[$stack_ptr] = array($x["LOT_NUMB"], $x["LOT_SUFFIX"]);
$debug .= "<br>stk_ptr=$stkptr; stack=";
debug_var($stack);
$debug .= "<br>";

stk_ptr=-1;
x=array 14 { ITEM_ID=>29; AUCTION_ID=>21; BHID=>77143; LOT_NUMB=>11;
LOT_SUFFIX=>; SALE_ORDER=>; FOOTNOTES=>; CATALOG_UPDATE=>; COMMENTX=>;
PRINT_CATALOG=>Y; PART_OF_LOT_NUMB=>13; PART_OF_LOT_SUFFIX=>;
FREE_PART=>Y; CATEGORY=>; }
stk_ptr=; stack=array 2 { 0=>array 2 { 0=>13; 1=>; }
=>array 2 { 0=>11; 1=>; }
}

As you can see, stk_ptr is "", and so when it is used as a subscript,
stack[0] is not overwritten, which hangs the whole script in an infinite
loop.

[Bob Stearns]

PTM wrote:

"Bob Stearns" <rs**********@charter.netwrote in message
news:bw****************@fe04.lga...

>>I have a variable v with the value -1. After v++ it has the value "" not 0.
Since I am using it for a subscript, the "" value is not overwriting the 0
element of the array as desired. Should v++ ever give a non-numeric value?

I used to use a variable initialised with -1, and never noticed the problem
you are having.
What are you trying to do with it and have you got an example of the code so
we can see what's going on?

Phil

Here is a script fragment and the debugging output therefrom:

dosql($sql, "S AUI 3", -1, "", $res, $n);
$debug .= "<br>stk_ptr=$stk_ptr; ";
while($x=odbc_fetch_array($res)) {
$debug .= "<br>x="; debug_var($x); $debug .= "<br>";
$item_list[$n_animals] = $x["ITEM_ID"];
$free = $x["FREE_PART"];
$free_list[$n_animals] = $free;
if($free!="Y") $chg_animals++;
$n_animals++;
$stk_ptr++;
$stack[$stack_ptr] = array($x["LOT_NUMB"], $x["LOT_SUFFIX"]);
$debug .= "<br>stk_ptr=$stkptr; stack=";
debug_var($stack);
$debug .= "<br>";

stk_ptr=-1;
x=array 14 { ITEM_ID=>29; AUCTION_ID=>21; BHID=>77143; LOT_NUMB=>11;
LOT_SUFFIX=>; SALE_ORDER=>; FOOTNOTES=>; CATALOG_UPDATE=>; COMMENTX=>;
PRINT_CATALOG=>Y; PART_OF_LOT_NUMB=>13; PART_OF_LOT_SUFFIX=>;
FREE_PART=>Y; CATEGORY=>; }
stk_ptr=; stack=array 2 { 0=>array 2 { 0=>13; 1=>; }
=>array 2 { 0=>11; 1=>; }
}

As you can see, stk_ptr is "", and so when it is used as a subscript,
stack[0] is not overwritten, which hangs the whole script in an infinite
loop.

[Andy Hassall]

On Thu, 27 Jul 2006 18:14:02 -0400, Bob Stearns <rs**********@charter.net>
wrote:

>Andy Hassall wrote:

>On Thu, 27 Jul 2006 17:47:50 -0400, Bob Stearns <rs**********@charter.net>
wrote:

>>>I have a variable v with the value -1. After v++ it has the value "" not
0. Since I am using it for a subscript, the "" value is not overwriting
the 0 element of the array as desired. Should v++ ever give a
non-numeric value?

No - post a script and output demonstrating this?

Since you're not on the latest release of a branch the standard advice would
be "upgrade", though, if this actually happens.

Here is a script fragment and the debugging output therefrom:

[snip]

>
stk_ptr=; stack=array 2 { 0=>array 2 { 0=>13; 1=>; }
=>array 2 { 0=>11; 1=>; }
}

As you can see, stk_ptr is "", and so when it is used as a subscript,
stack[0] is not overwritten, which hangs the whole script in an infinite
loop.

Can you reduce this to a script that can be run stand-alone?

--
Andy Hassall :: an**@andyh.co.uk :: http://www.andyh.co.uk
http://www.andyhsoftware.co.uk/space :: disk and FTP usage analysis tool

[Alvaro G. Vicario]

*** Bob Stearns escribió/wrote (Thu, 27 Jul 2006 17:47:50 -0400):

I have a variable v with the value -1. After v++ it has the value "" not
0. Since I am using it for a subscript, the "" value is not overwriting
the 0 element of the array as desired. Should v++ ever give a
non-numeric value?

Can you post actual PHP code we can copy, paste and try?

Never mind, I suppose you're casting numbers from/to strings. Check the
"Type Juggling" chapter in PHP manual.
--
-+ http://alvaro.es - Álvaro G. Vicario - Burgos, Spain
++ Mi sitio sobre programación web: http://bits.demogracia.com
+- Mi web de humor con rayos UVA: http://www.demogracia.com
--

[Bob Stearns]

Alvaro G. Vicario wrote:

*** Bob Stearns escribió/wrote (Thu, 27 Jul 2006 17:47:50 -0400):

>>I have a variable v with the value -1. After v++ it has the value "" not
0. Since I am using it for a subscript, the "" value is not overwriting
the 0 element of the array as desired. Should v++ ever give a
non-numeric value?

Can you post actual PHP code we can copy, paste and try?

Never mind, I suppose you're casting numbers from/to strings. Check the
"Type Juggling" chapter in PHP manual.

My error. Twice I mistyped the variable $stk_ptr; once as $stkptr and
once as $stack_ptr. The errors offset each other in such a way as to
lead me to the erroneous conclusion about ++.

[Bob Stearns]

Andy Hassle wrote:

On Thu, 27 Jul 2006 18:14:02 -0400, Bob Stearns <rs**********@charter.net>
wrote:

>>Andy Hassall wrote:

>>>On Thu, 27 Jul 2006 17:47:50 -0400, Bob Stearns <rs**********@charter.net>
wrote:

I have a variable v with the value -1. After v++ it has the value "" not
0. Since I am using it for a subscript, the "" value is not overwriting
the 0 element of the array as desired. Should v++ ever give a
non-numeric value?

No - post a script and output demonstrating this?

Since you're not on the latest release of a branch the standard advice would
be "upgrade", though, if this actually happens.

Here is a script fragment and the debugging output therefrom:

[snip]

>>stk_ptr=; stack=array 2 { 0=>array 2 { 0=>13; 1=>; }
=>array 2 { 0=>11; 1=>; }
}

As you can see, stk_ptr is "", and so when it is used as a subscript,
stack[0] is not overwritten, which hangs the whole script in an infinite
loop.

Can you reduce this to a script that can be run stand-alone?

My error. Twice I mistyped the variable $stk_ptr; once as $stkptr and
once as $stack_ptr. The errors offset each other in such a way as to
lead me to the erroneous conclusion about ++.

[Henk Verhoeven]

Bob Stearns wrote:

(..)
My error. Twice I mistyped the variable $stk_ptr; once as $stkptr and
once as $stack_ptr. The errors offset each other in such a way as to
lead me to the erroneous conclusion about ++.

Hi Bob,

If you set error reporting to E_ALL php will tell you about these
typo's. Once you got your code cleaned up it can save you a lot of time ;-)

call from the top of your script:
error_reporting(E_ALL);

or in php.ini change the line:
error_reporting = E_ALL & ~E_NOTICE & ~E_STRICT

into:
error_reporting = E_ALL & ~E_STRICT

(for php4 leave out & ~E_STRICT)

Greetings,

Henk Verhoeven,
www.phpPeanuts.org.