laravel collect 之间的 If 子句

Question

情况：

$post_1 = 'john'; 
$post_2 = 30;

$arr = array(['name'=>'john','number'=>70],['name'=>'clark','number'=>50]); 
$collection = collect($arr);

if($post_1 == 'john')
{
     $collection->where('name',$post_1); 
}
if($post_2 == 70)
{
     $collection->where('number',$post_2);
}
var_dump($collection->all());

但这行不通。我想包括过滤器，但这取决于 post 参数是否存在。

Answer 1

我想你可以使用 when

$result= $collection->when(($post_1=="john"), function ($collection)use($post_1) {

        return $collection->where('name',$post_1);

    })->when(($post_2 == 70), function ($collection)use($post_2) {

        return $collection->where('number',$post_2);

    })->all();


dd($result);

或

$collection->when(($post_1=="john"), function ($collection)use($post_1) {

            return $collection->where('name',$post_1);

        })->when(($post_2 == 70), function ($collection)use($post_2) {

            return $collection->where('number',$post_2);

        });
    
    
    dd($collection->all());

参考：https://laravel.com/docs/8.x/collections#method-when

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