千里码群里问了又到这来?

话说下次能贴数组的json数据吗? 放个github也行啊

demo:https://3v4l.org/D6buv

$order = [465, 472, 442, 410, 396, 395, 297, 364, 355, 221]; $products = array( array( '_id' => '57208ea27f8b9a5e048b4598', 'topic_id' => 472, 'host_pic' => '/topic', 'topic_name' => 'goods 1', 'template' => 4 ), array( '_id' => '57208ea27f8b9a5e048b4598', 'topic_id' => 410, 'host_pic' => '/topic', 'topic_name' => 'goods 2', 'template' => 2 ), array( '_id' => '57208ea27f8b9a5e048b4598', 'topic_id' => 465, 'host_pic' => '/topic', 'topic_name' => 'goods 3', 'template' => 1 ), array( '_id' => '57208ea27f8b9a5e048b4598', 'topic_id' => 396, 'host_pic' => '/topic', 'topic_name' => 'goods 4', 'template' => 4 ) ); $column = array_flip(array_column($products, 'topic_id')); $_products = []; foreach ($order as $row) { if (! empty($column[$row])) { $_products[] = $products[$column[$row]]; } } print_r($_products);

ls的代码中! empty改成isset，否则$product[0]做不了排序
另外如果topic_id有重复的话，重复的元素不会在新书组中
所以还是写两个foreach吧

$tmp = []; foreach($order as $key=>$val) { foreach($products as $k=>$v) { if($v['topic_id'] == $val) { $tmp[] = $v; } } }