thinkphp a method, r method, m method, D method Difference

In thinkphp, there are several ways to instantiate an object, if it is a class, there is a and r methods, the difference is that the A method is only an instantiation of the object, and the R method can be instantiated at the same time the method inside the object, where you need to specify, such as the following instance Code:

1<?PHP2 namespace admin\controller;3  usethink\controller;4 5 classGoodscontrollerextendscontroller{6      public functionshowlist () {7 8         //instantiating the controller a method9         $test=a ("Manager");Ten         Echo $test-test1 (); one  a         Echo"<br/>"; -  -         //You can also go across module calls the         $test _m=a ("home/goods"); -         Echo $test _m-Test (); -  -         Echo"<br/>"; +         //the R method can take the execution of the corresponding module -R ("home/goods/test"); +         //$this->display (); a     } at}

As can be seen from the above, the R method can also be used to Cross-module to Instantiate.

In addition, in model data models, it is necessary to use the following two methods, one is the D method, one is the M method, the former is the instantiation of the data model class, and the latter is the parent class of the instantiated data model.

1<?PHP2 namespace admin\controller;3  usethink\controller;4 classTestControllerextendscontroller{5      public functiontest1 () {6         $mythinkphp=m ("user");7         $t=$mythinkphp-Select ();8         Echo"<pre>";9         //var_dump ($mythinkphp->select ());Ten //echo Count ($t); one //echo "<br/>"; a //echo Count ($t [1]); - //echo "<br/>"; - //for ($i =0; $i <count ($t); $i + +) { the //if ($t [$i] [' name ']== ' xuning ') { - //echo "exists for this user, user ID is". ($i-1); -         //         } -         // } + //echo "<br/>"; - //this completes the data traversal from the database +         Echo"<center>"; a         Echo"; at         Echo"<table border= ' 1px ' >"; -          for($i= 0;$i<Count($t);$i++){ -             Echo"<tr>"; -                     Echo"<td>"; -                     Echo $t[$i[' ID ']; -                     Echo"</td>"; in                     Echo"<td>"; -                     Echo $t[$i[' name ']; to                     Echo"</td>"; +                     Echo"<td>"; -                     Echo $t[$i[' Password ']; the                     Echo"</td>"; *             Echo"</tr>"; $         }Panax Notoginseng         Echo"</table>"; -         Echo"</center>"; the         Echo"</pre>"; +         $t 2=d ("test_1"); a         $temp=$t 2-Select (); the         Echo $temp[0] [' name ']; +     } -      public functiontest2 () { $         //in fact, the instantiation here is to build the database object, not accurate to the table, at the same time $ //we can also not build a data model to use directly, so, -         $t=New\model\testmodel; -Show_bug ($t); the     } -      public functiontest3 () {Wuyi         $user=d ("Test"); theShow_bug ($user); -     } wu}

Although there is no difference from usage, the D method instantiates only the defined data model class, but the M method instantiates the parent class of the data model.

Reference http://blog.csdn.net/mycodedream/article/details/45340949

thinkphp a method, r method, m method, D method Difference