使用 yii2 findall 并访问第一个元素

Question

我想在 yii2 中识别 find all 中的第一个元素，但我还没有找到一种方法来做到这一点，

这是代码：

$services = TblWorksTags::find()->where(["active"=>true])->all();
foreach ($services as $service){
    echo '<li>'.$service->name.'</li>
}

根据上面的代码，我希望它的第一项具有不同的 class，例如

$services = TblWorksTags::find()->where(["active"=>true])->all();
foreach ($services as $service) {
    //if its the first element
    echo '<li class="active">'.$service->name.'</li>  //this has a diffrent  <li>

    //for the other elements
    echo '<li>'.$service->name.'</li>
}

Answer 1

您可以通过一些 counter 来完成，如下所示：-

<?php
$services = TblWorksTags::find()->where(["active"=>true])->all();

$counter = 1;
foreach ($services as $service){
    if($counter ==1){
        //if its the first element
        echo '<li class="active">'.$service->name.'</li>';  // quote and ; missed in your post
    }else{
        //for the other elements
        echo '<li>'.$service->name.'</li>'; // quote and ; missed in your post

    }
$counter++;
} 
?>

我不知道 Yii，所以如果下面的代码：-

$services = TblWorksTags::find()->where(["active"=>true])->all();

给你一个索引数组（类似于 Array(0=>'something',1=>'something else', ......so on)）。然后你可以像下面这样使用它的索引本身：-

<?php
$services = TblWorksTags::find()->where(["active"=>true])->all();

foreach ($services as  $key=> $service){ //check $key is used here
    if($key == 0){
        //if its the first element
        echo '<li class="active">'.$service->name.'</li>';  // quote and ; missed in your post
    }else{
        //for the other elements
        echo '<li>'.$service->name.'</li>'; // quote and ; missed in your post
    }
} 
?>

使用 yii2 findall 并访问第一个元素

using yii2 findall and accessing the first element

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yii2

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