your problem is where you are creating the array, see my notes
> -----Original Message-----
> From: Onaje Johnston [mailto:[EMAIL PROTECTED]]
> Sent: 17 February 2001 22:47
> To: [EMAIL PROTECTED]
> Subject: compare arrays problem
>
>
> I am hoping that someone really understands arrays reads this
> and can tell
> me why the following isn't working as I expect it to. I've
> been trying for
> days to get it to work.
>
> $pages=mysql_query("SELECT CP.page_id, pagename FROM
> cluster_pagetbl as CP,
> pagetbl WHERE
> CP.cluster_id = '$id' AND CP.page_id=pagetbl.page_id order by
> page_id");
>
> /*
> SQL Result for $id=1:
> page_id pagename
> 1 breakingnews
> 3 weather
> */
declare the array here:
$pgids= array();
>
> if (mysql_Numrows($pages)>0) {
>
> $prows=mysql_NumRows($pages);
> $i=0;
> while ($i<$prows){
>
> //figure out how to get page ids into array
> $pid= mysql_result($pages,$i, page_id);
> $pagename =mysql_result($pages, $i, pagename);
>
> $pgids= array("$pid" => "$pagename");
this reinitialises the array for each row of the answer to your query, what
you should do here is:
$pgids["$pid"] = "$pagename";
>
> foreach($pgids as $pid => $pagename){
> print $pid.' => '.$pagename.'<br>';
> }
>
> /* prints:
> 1 => breakingnews
> 3 => weather
prints each row but at no point are both in the array. on each pass only the
current row is in your array.
>
> At this point the correct number of values appear to be in
> the pgids array
> */
no they are not, only one is in at a time
>
> $i++;
> }
> }
>
> $query2=mysql_query("select page_id, pagename FROM
> pagetbl order by page_id");
>
> /*
> SQL Result:
> page_id pagename
> 1 breakingnews
> 2 pastnews
> 3 weather
> */
>
> if (mysql_Numrows($query2)>0) {
>
> $numrows=mysql_NumRows($query2);
> $x=0;
> while ($x<$numrows){
>
> $mpid=mysql_result($query2,$x, page_id);
> $mpagename=mysql_result($query2,$x, pagename);
>
> $mpgids= array("$mpid" => "$mpagename");
>
> foreach ($mpgids as $mpid => $mpagename){
> print '<input type=checkbox name=page_ids[] value="'.$mpid.'"';
>
> if ($pgids == $mpgids){ print " checked"; }
> print '>'.$mpagename;
> }
>
> // prints out three checkboxes, since that's the total number of pages
> present
> //but only the third checkbox (weather) gets checked, the
> first one should
> be checked also
that's because your array only contains the last row ...
>
> $x++;
> }
> }
>
> //I used the array intersect function to doublecheck what is
> going on and it
> finds only weather also
> //What is happening to the first value?
>
> $diff = array_intersect($mpgids,$pgids);
>
> foreach ($diff as $element){
> print '<p>'.$element.'<br>';}
>
> //prints: weather
>
Tim Ward
Senior Systems Engineer
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