yii2的findall和訪問的第一個元素

Question

我沃爾德想確定在第一個元素找到所有在yii2，但我還沒有喜歡，就一定能做到這一點，

這是代碼：

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

從上面的代碼我想它有具有不同的類，它是像

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

您可以通過一些counter像下面這樣做的第一個項目： -

<?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的，因此，如果這下面的代碼： -

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

是給你一個索引數組（類似Array(0=>'something',1=>'something else', ......so on)）。那麼你可以使用它的索引本身象下面這樣： -

<?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 
    } 
} 
?>