The difference between Thinkphp's A, R, M, and D methods_PHP tutorial

The difference between Thinkphp’s A, R, M, and D methods

In Thinkphp, there are several methods for instantiating objects. If it is a class, there are A and R methods. The difference is that the A method is only an instantiation of the object, while the R method can instantiate the methods in the object at the same time. You need to specify it here, such as the following example code:

<!--?php
namespace Admin\Controller;
use Think\Controller;

class GoodsController extends Controller{
	public function showlist(){

		//实例化控制器A方法
		$test=A("Manager");
		echo $test--->test1();

		echo "
";

		//也可以去跨模块调用
		$test_m=A("Home/Goods");
		echo $test_m->test();

		echo "
";
		//R方法可以取执行对应模块下面的
		R("Home/Goods/test");
		// $this->display();
	}
}

As can be seen from the above, R methods can also be instantiated across modules.

In addition, we must use the following two methods in the Model data model, one is the D method and the other is the M method. The former is the instantiated data model class, and the latter is the parent class of the instantiated data model.

<!--?php
namespace Admin\Controller;
use Think\Controller;
class TestController extends Controller{
	public function test1(){
		$mythinkphp=M("user");
		$t=$mythinkphp--->select();
		echo "

"; // var_dump($mythinkphp->select()); // echo count($t); // echo "
"; // echo count($t[1]); // echo "
"; // for($i=0; $i<count($t); border="'1px'" br="" echo="" function="" i="0;" is="" pre="" public="" t="new" t2="D("test_1");" table="" temp="$t2->select();" test="" this="" user="D("Test");">
虽然从用法上看不出什么差别，但是内部确实不同的，D方法只实例化定义的数据模型类，而M方法去实例化数据模型的父类。<p> </p><p> </p><p> </p></count($t);>

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