Laravel 8 whenNotEmpty() {#collection-method}
whenNotEmpty
方法当集合不为空时,将执行给定的回调函数:
$collection = collect(['michael', 'tom']);
$collection->whenNotEmpty(function ($collection) {
return $collection->push('adam');
});
$collection->all();
// ['michael', 'tom', 'adam']
$collection = collect();
$collection->whenNotEmpty(function ($collection) {
return $collection->push('adam');
});
$collection->all();
// []
$collection = collect();
$collection->whenNotEmpty(function ($collection) {
return $collection->push('adam');
}, function ($collection) {
return $collection->push('taylor');
});
$collection->all();
// ['taylor']
与 whenNotEmpty
相反的方法,请查看 whenEmpty
方法。