使用 Laravel 键迭代数组
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Iterate array with key Laravel
提问by Funny Frontend
I have a ecommerce-web, In my controller I have a code that controls a list of countries that are displayed in the cart.
我有一个电子商务网站，在我的控制器中，我有一个代码来控制购物车中显示的国家/地区列表。
If the price of the country where we are is greater than or equal to the price of shipping to other countries, these countries are added to the list:
如果我们所在国家/地区的价格大于或等于运往其他国家/地区的价格，则将这些国家/地区添加到列表中：
This is my controller code:
这是我的控制器代码：
$params['final_countries_list'] = [];
$list_countries = Config::get('app.web_config.shipment.countries');
$base_price = $list_countries[Config::get('app.web_country')]['price'];
foreach($list_countries as $key=>$value) {
if ($value['price'] <= $base_price)
$params['final_countries_list'][$key] = $value;
}
Well, if I do a dd($params['final_countries_list']), I get this result.
好吧，如果我执行 dd($params['final_countries_list'])，我会得到这个结果。
array(13) {
["deu"] array(2) {
["name"] "Deutschland"
["price"] 9
}
["che"] array(2) {
["name"] "Schweiz"
["price"] 9
}
["fra"] array(2) {
["name"] "France"
["price"] 8
}
["gbr"] array(2) {
["name"] "United Kingdom"
["price"] 9
}
ETC,ETC...
等等，等等……
Now I want to get this(deu, fra, gbr, etc) in view cart.blade.php
现在我想在cart.blade.php 中看到这个（deu、fra、gbr 等）
In the cart.blade.php have this code to get what I want:
在cart.blade.php 中有这个代码来获得我想要的：
<select name="country" id="pais">
<option value="" selected><--- Choose Country ---></option>
<?php foreach($final_countries_list as $key => $value){?>
<option value="<?php echo $key?>"><?php echo $value. ' ('.$key.')';?></option>
<?php } ?>
</select>
And I get the following error:
我收到以下错误：
ErrorException (E_UNKNOWN) Array to string conversion (View: C:\xampp\htdocs\my_web_name\app\views\cart.blade.php)
ErrorException (E_UNKNOWN) 数组到字符串的转换（视图：C:\xampp\htdocs\my_web_name\app\views\cart.blade.php）
How I can fix it?
我该如何解决？
回答by lukasgeiter
The simplest way would just be to don't assign the full value but only the name: (If you don't need the price in the view)
最简单的方法就是不分配全部价值，而只分配name:（如果您不需要视图中的价格）
foreach($list_countries as $key=>$value) {
if ($value['price'] <= $base_price)
$params['final_countries_list'][$key] = $value['name'];
}
An a bit nicer (in my opinion)
好一点（在我看来）
$list_countries = array_filter($list_countries, function($value){
return $value['price'] <= $base_price
});
$params['final_countries_list'] = array_map(function($value){
return $value['name'];
}, $list_countries);
回答by Semyon Zhikharev
You should use $country['name']
P.S.
If You are using blade you can simplify your code by using blade helper shortcodes
(e.g. @foreach).
With this in mind you can rewrite your code simpler
您应该使用$country['name']
PS
如果您使用刀片，您可以通过使用刀片助手短代码
（例如@foreach）来简化您的代码。
考虑到这一点，您可以更简单地重写代码
<select name="country">
<option value="" selected>Select your county</option>
@foreach($final_countries_list as $key => $country)
<option value ="{{ $key }}">{{ $country['name'] }} ({{ $key }})</option>
@endforeach
</select>回答by Jeff Lambert
The issue is that you are iterating over an array of arrays, but the sub-array you are treating as if it were a string (why you're getting the error). If I understand you correctly, a simple change can get you what you want:
问题是您正在迭代一个数组数组，但是您正在处理的子数组就好像它是一个字符串（为什么会出现错误）。如果我理解正确，一个简单的改变就能让你得到你想要的：
<option value="<?php echo $key?>"><?php echo $value['name']. ' ('.$key.')';?></option>
