Laravel 5.2关键返回索引中的foreach关联数组

Question

我有这件哦代码：

<?php

$levels = array( "0" => "Super User", "1" => "Administrator", "10" => "10", "20" => 20, "30" => "30", "40" => "40", "50" => "50", "99" => "99 News homepage" );

?>

<select name="level" id="modify_modal_level">
    @foreach( $levels as $key => $val )
            <option value="{{ $key }}" <?php echo $selected==$key ? 'selected="selected"': ""?>>{{ $val }}</option>
    @endforeach
</select>

为什么foreach里面的$ key返回数组的INDEX？

示例：

@foreach( $levels as $key => $val )
   {{ $key }},
@endforeach

打印出来： 1,2,3,4,5,6,7,8，

代替： ＆＃39; 0＆＃39;＆＃39; 1＆＃39;＆＃39; 10＆＃39;＆＃39; 20＆＃39;＆＃39; 30＆＃39;＆＃39; 40＆ ＃39;，＆＃39; 50＆＃39;＆＃39; 99＆＃39;

但$ key变量中的foreach循环必须返回关联数组的键值，而不是键索引！

我的选择结果：

<select name="level" id="modify_modal_level">
<option value="1">Super User</option>
<option value="2">Administrator</option>
<option value="3">10</option>
...
<option value="8">99 News homepage</option>
</select>

而不是：

<select name="level" id="modify_modal_level">
<option value="0">Super User</option>
<option value="1">Administrator</option>
<option value="10">10</option>
...
<option value="99">99 News homepage</option>
</select>

谢谢！

Answer 1

您的代码现在可以正常运行;您是否确定$levels正确生成，因为您在此处显示它？

<强>控制器

$levels = [
    0 => "Super User",
    1 => "Administrator",
    10 => 10,
    20 => 20,
    30 => 30,
    40 => 40,
    50 => 50,
    99 => "99 News homepage",
];

return view('yourview', [
    'levels' => $levels,
    'selected' => '99'
]);

<强> yourview.blade.php

<select name="level" id="modify_modal_level">
    @foreach ($levels as $key => $value)
        <option value="{{ $key }}" @if ($selected == $key) selected @endif>{{ $value }}</option>
    @endforeach
    {{-- $key will be 0, 1, 10, 20, 30, 40, 50, 99 --}}
    {{-- $value will be "Super User", "Administrator", 10, 20, 30, 40, 50, "99 News homepage" --}}
</select>

请注意，我还更新了使用@if Blade语法，因为它更清晰，更易于阅读。

访问视图时，我会收到此消息：