Smarty: check if variable is in array - php

Question

I'm using php with smarty. In php I have two arrays:
$code = Array
(
[n_id] => 1
[t_code] => ABC123
[t_description] => Test code
[b_enabled] => Yes
[n_type] => 3
[dt_start] =>
[dt_end] =>
[n_min_req_gbp] => 0
[n_min_req_usd] => 0
[n_amount_gbp] =>
[n_amount_usd] =>
[n_max_overall_gbp] =>
[n_max_overall_usd] =>
[n_extra] => 6
[b_reuse] => No
[n_applications] => Array
(
[0] => 2
)
)
and
$all_application = Array
(
[1] => New registration
[2] => Mid-subscription upgrade
[3] => Subscription renewal
[4] => Additional purchase
)
Note that the second array may - and will - grow, this is the reference data, from which n_applications array field in the first array is built. That is, the array in n_applications will contain a subset of keys from the $all_applications arrays.
Now, I'm assigning these two arrays into the template:
$template->assign('code', $code);
$template->assign('apps', $all_applications);
And in the template, I'm creating a form for editing the fields in the $code array. Everything is working fine except the 'applications' selection. I want to pre-select those apps that are already in the n_applications field. So, in my template I have this:
<select name="c_apps[]" size="3" class="multiselect" multiple="multiple">
{foreach from=$apps key=k item=a}
{assign var=v value=$k|#array_search:$code['n_applications']}
<option value="{$k}"{if $v!==FALSE} selected="selected"{/if}>{$a|escape}</option>
{/foreach}
</select>
However this doesn't work as expected - and ALL options end up being selected. I tried using in_array function - but with the same result. What's the best way to achieve what I'm after?

Answer 1

After a bit of struggling in all possible directions, I finally managed to pull it off like this (smarty code only)
<select name="c_apps[]" size="3" class="multiselect" multiple="multiple">
{foreach from=$apps key=k item=a}
{if #in_array($k, $code.n_applications)}
{assign var=v value=true}
{else}
{assign var=v value=false}
{/if}
<option value="{$k}"{if $v} selected="selected"{/if}>{$a|escape}</option>
{/foreach}
</select>
And this did the trick.

Answer 2

You can do it like this:
<select name="c_apps[]" size="3" class="multiselect" multiple="multiple">
{foreach from=$apps key=k item=a}
<option value="{$k}"{if in_array($k, $code.n_applications)} selected="selected"{/if}>{$a|escape}</option>
{/foreach}
</select>

Answer 3

I've done something similar a few years back, and stumbled over the same logical challenge.
My solution was to modify the base array (in your case, $all_applications) while adding another key there (maybe ['opt_selected']). I left the default value empty, and for the data I wanted to have selected, I've changed the value to, guess what, ... selected="selected".
This makes it rather easy for your Smarty template:
<option value="{$k}" {$a.opt_selected|default:''}>{$a|escape}</option>
It might not be the best solution, but it helps leaving alot of code out of the template where I usually don't want too much program logic.
Update
To counter having the HTML part in your php code, you might as well just flag the array:
$all_applications['opt_selected'] = 1
...and then arrange Smarty like this:
<option value="{$k}" {if $a.opt_selected eq '1'}selected="selected"{/if}>
{$a|escape}
</option>