[FX.php List] Posting an array help

[Joel Shapiro]

Hi Steve

It was the user note:

"A wee idiom for KEEPING only those elements of an array $a that  
appear in an array $b (without introducing any elements of $b that do  
not appear in $a).
<?php
array_diff($a, array_diff($a, $b))
?>"

that I thought might be relevant for William, but to be honest I  
haven't put much thought into it.  Just thought I'd mention it in  
case William wanted to pursue it.

Your thoughts of using array_diff() with array_intersect() sound  
clever, though.

Best,
-Joel


On Oct 22, 2007, at 2:43 PM, Steve Winter wrote:

> Hi Joel,
>
> As I understand it array_dif() will tell provide you with an array  
> of the
> items that are not in both of the two arrays that your feed to  
> it... I'm not
> really sure how that could be helpful, since it wouldn't be able to  
> tell you
> which ones to add, or remove...
>
> I guess if you did
>   $difference = array_dif($v1AoE, $medAoEData);
> Then you could do a foreach($difference as $item) and test against  
> the two
> arrays, which I guess means that there may be less items to have to  
> loop
> through if there were not many changes, which may be a little  
> quicker...??
>
> How about this for a random, untested idea;
>   $difference = array_dif($v1AoE, $medAoEData);
> So now you know which ones must either be added or removed, then
>   $adds = array_intersect($difference, $v1AoE);
>   $deletes = array_intersect($difference, $medAoEData);
> Then you could loop through each of $adds and $deletes
>   foreach($adds as $add) {
>     // add this record
>     // FMNew()
>   }
>   foreach($deletes as $delete) {
>     // add this record
>     // FMDelete()
>   }
>
> Should work, I guess if there were lots of items in $v1AoE and or
> $medAoEData, and there were likely to be few changes, then it  
> should also be
> quicker than two lengthy foreach loops...
>
> Cheers
> Steve
>
> -----Original Message-----
> From: fx.php_list-bounces at mail.iviking.org
> [mailto:fx.php_list-bounces at mail.iviking.org] On Behalf Of Joel  
> Shapiro
> Sent: Monday, 22 October 2007 8:10 p.m.
> To: FX.php Discussion List
> Subject: Re: [FX.php List] Posting an array help
>
> Has anybody used things like array_diff()?
> http://us2.php.net/manual/en/function.array-diff.php
>
> The top User Note seems to point to something that might be relevant
> for William's situation.
>
> (I'd been looking into this and related array functions just last
> week, but couldn't find anything that would easily compare various
> sub-arrays, so I ended up looping through the arrays afterall)
>
> -Joel
>
>
> On Oct 22, 2007, at 8:39 AM, Steve Winter wrote:
>
>> Hi William,
>>
>> Umm, to my knowledge you can't use in_array to compare two arrays,
>> you need
>> to loop through one of the arrays, and check the values of that
>> array, in
>> the other, and then visa versa (at least that's what I'd do)
>>
>> My approach would be;
>>
>> foreach($v1AoE as $vlValue) {
>>   if(!in_array($v1Value, $medAoEData)) {
>>     // this means that it's in the posted array but not in the db
>>     // FMNew() time
>>   }
>> }
>>
>> foreach($medAoEData as $medValue) {
>>   if(!in_array($medValue, $v1AoE)) {
>>     // this means that it's in the db but not the posted array
>>     // FMDelete() time
>>   }
>> }
>>
>> Be interested to hear how others would approach this to...
>>
>> Cheers
>> Steve
>>
>> -----Original Message-----
>> From: fx.php_list-bounces at mail.iviking.org
>> [mailto:fx.php_list-bounces at mail.iviking.org] On Behalf Of William
>> Downs
>> Sent: Monday, 22 October 2007 4:28 p.m.
>> To: FX.php Discussion List
>> Subject: [FX.php List] Posting an array help
>>
>> Hi there guys,
>>
>> Headbanging the key board now ! Perhaps someone has already done  
>> this.
>>
>> The user selects a record - this record has child records.
>> I allow the user to check box select any number of child records.
>> I then POST the array to the next page
>> The next page runs an FMFind for the original DB values
>>
>> if there are new values in the POSTed array, they should be created
>> (FMNew) in the child table
>> If they are not in the POSTed array, it means that they have been
>> deselected, and should be deleted in the child table.
>>
>> Here is where it falls flat - ($vlAoE is the POSTed array and
>> $medAoEData is the array from the DB)
>>
>> if(!in_array($vlAoE,$medAoEData)) {
>>                //It should  create the new values here
>> } else {
>>              if(!in_array($medAoEData, $vlAoE,)) {
>>                //It should delete the old values here
>> }
>> }
>>
>> Probably obvious what I have done wrong - but any advice more than
>> appreciated.
>>
>> Regards
>>
>> William
>>
>> -- 
>> William Downs
>> Development and Support
>> BD Databases Ltd
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