About thinkphp implementing a two-level loop read code

This article mainly introduces the thinkphp implementation of the two-level loop read method, is thinkphp array-based database operation is very common skills, the need for friends can refer to the following

The example in this paper describes the method of thinkphp implementation of two-level cyclic reading. Share to everyone for your reference. The implementation method is as follows:

$Category = D (' Category ')->where (' Category_pid=0 ')->findall ();//dump ($Category);  if (!empty ($Category)) {//Determines whether the primary level is an empty foreach ($Category as $key = = $value) {   //cyclic read $pid =  $value [' category_id '] ;//Field Assignment $category[$key] [' child '] = D (' category ')->where ("category_pid = $pid")->select ();//echo D (' category ')- >getlastsql (); Print SQL statement}}//dump ($Category); $this->assign (' Category ', $Category);//Map value

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