Question

dynamic array declaration in php

Asked by: deersuper

$i=0;
$datearray;
$array2;
while($row=mysql_fetch_array($result))
{
      $datearray[i]=$row['setnum'];
      //echo $datearray[i];
      $array2[i]=$row['date'];
      //echo $array2[i];
      $i=$i+1;
}

echo 'this is the size'.$i;

echo $datearray[0]."noth";

The echo statements together show "this is the size 6 noth";

This means that the datearray[0] is not printing since it is empty.
$i is printing because it was declared outside the while loop.
$datearray was declared and used INSIDE the while loop and I am sure it is falling out of scope as soon as the while loop ends.
(Inside the while loop $datearray prints its contents).

How can I declare an array outside the while loop so that it becomes accessible anywhere in the program.
Is there a way of declaring global arrays like in Java or C.

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Asked On
2004-05-14 at 09:00:38ID20989659
Tags

php

,

array

,

dynamic

Topic

PHP Scripting Language

Participating Experts
3
Points
250
Comments
10

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Answers

 

by: ThGPosted on 2004-05-14 at 09:54:30ID: 11070119

You are making some bad mistakes:

1. variables are NOT declared in PHP, you just use them (maybe you mean "initializated"
2. $datearray[i] outputs a warning (unless you disabled them), you are missing a "$" sign..

 

by: deersuperPosted on 2004-05-14 at 10:36:39ID: 11070522

1 - I meant initialized....
2 - when I print the $datearray inside the while loop it prints the correct data. I dont understand what u mean when you say
"$datearray[i] outputs a warning (unless you disabled them), you are missing a "$" sign.."

 

by: ThGPosted on 2004-05-14 at 12:39:03ID: 11071407

> $datearray[i]=$row['setnum'];

this is just bad PHP syntax, you probably mean:

$datearray[$i]=$row['setnum'];

 

by: skullnobrainsPosted on 2004-05-14 at 16:19:02ID: 11073068

<< This means that the datearray[0] is not printing since it is empty.
$i is printing because it was declared outside the while loop. >>

$array[i] in php is $array['i'] (quotes are recommended but not an obligation. the array is indexed in your case)
$datarray[i] contains at the end of the script the value of the LAST retrieved date
actually each loops affects this SAME element of $datarray
$datarray[0] is empty because nothing has ever been affected to it nor to any other element of the array.

 

by: gowniPosted on 2004-05-14 at 21:36:19ID: 11073898

Hello Deersuper,

In the following code you gave,
$i=0;
$datearray;
$array2;
while($row=mysql_fetch_array($result))
{
     $datearray[i]=$row['setnum'];
     //echo $datearray[i];
     $array2[i]=$row['date'];
     //echo $array2[i];
     $i=$i+1;
}

In the while loop you are doing this
     $datearray[i]=$row['setnum'];
which actually should be like this
     $datearray[$i]=$row['setnum'];
 thats why when you try to access $datearray[0] its empty.

Hope that works out your problem
Gowni




 

by: deersuperPosted on 2004-05-16 at 09:17:08ID: 11081991

Thanks ThG,
It was a small and stupid error and it works now !

I have a post in the javascript section and no one as yet has answered it ... think you guys could help ?

oh and btw thanks gowni but I had already implemented ThG's post earlier and he rightfully gets the points.

Take care guys . Will bug you later !

 

by: ThGPosted on 2004-05-16 at 10:10:48ID: 11082758

Why did you grade this answer with "B"? It looks your default grade but it's not good. You should read the following:
http://www.experts-exchange.com/help.jsp#hi73

 

by: deersuperPosted on 2004-05-19 at 06:32:27ID: 11107714

I am extremely sorry ThG. I really never read EE's description on grades. Where I studied, you had to be excellent to get a B and outright einsteinic to get an A. I was just following this habit I have - I guess. Is there any way I can change this grade to an A.
plus what is more beneficial for the experts rankings : points or grades ?

 

by: deersuperPosted on 2004-05-20 at 08:22:05ID: 11118119

Please go ahead and change the grade ! Again I am sorry for not assigning u the appropriate grade earlier.

20120131-EE-VQP-002

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