php Smarty：检查变量是否在数组中
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Smarty: check if variable is in array
提问by Aleks G
I'm using php with smarty. In php I have two arrays:
我正在使用带有 smarty 的 php。在 php 中，我有两个数组：
$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
和
$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_applicationsarray field in the first array is built. That is, the array in n_applicationswill contain a subset of keys from the $all_applicationsarrays.
请注意，第二个数组可能 - 而且将会 - 增长，这是参考数据，从中n_applications构建第一个数组中的数组字段。也就是说，数组 inn_applications将包含数组中键的子集$all_applications。
Now, I'm assigning these two arrays into the template:
现在，我将这两个数组分配到模板中：
$template->assign('code', $code);
$template->assign('apps', $all_applications);
And in the template, I'm creating a form for editing the fields in the $codearray. Everything is working fine except the 'applications' selection. I want to pre-select those apps that are already in the n_applicationsfield. So, in my template I have this:
在模板中，我创建了一个表单来编辑$code数组中的字段。除了“应用程序”选择外，一切正常。我想预先选择那些已经在n_applications现场使用的应用程序。所以，在我的模板中，我有这个：
<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_arrayfunction - but with the same result. What's the best way to achieve what I'm after?
然而，这并没有像预期的那样工作 - 并且最终选择了所有选项。我尝试使用in_array函数 - 但结果相同。实现我所追求的最佳方式是什么？
采纳答案by Aleks G
After a bit of struggling in all possible directions, I finally managed to pull it off like this (smarty code only)
经过在所有可能的方向上的一些挣扎，我终于设法像这样成功（仅限智能代码）
<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.
这成功了。
回答by Vilius Paulauskas
You can do it like this:
你可以这样做：
<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>
回答by Bjoern
I've done something similar a few years back, and stumbled over the same logical challenge.
几年前我做过类似的事情，并偶然发现了同样的逻辑挑战。
My solution was to modify the base array (in your case, $all_applications) while adding another key there (maybe ['opt_selected']). I left the default value empty, and for the data I wanted to have selected, I've changed the value to, guess what, ... selected="selected".
我的解决方案是修改基本数组（在你的情况下，$all_applications），同时在那里添加另一个键（也许['opt_selected']）。我离开的默认值清空，并为数据我想有选择的，我已经改变了价值，你猜怎么着，... selected="selected"。
This makes it rather easy for your Smarty template:
这使您的 Smarty 模板变得相当容易：
<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.
它可能不是最好的解决方案，但它有助于将大量代码从我通常不想要太多程序逻辑的模板中删除。
Update
更新
To counter having the HTML part in your php code, you might as well just flag the array:
为了防止在你的 php 代码中包含 HTML 部分，你最好只标记数组：
$all_applications['opt_selected'] = 1
...and then arrange Smarty like this:
...然后像这样安排Smarty：
<option value="{$k}" {if $a.opt_selected eq '1'}selected="selected"{/if}>
{$a|escape}
</option>
