instantiate a class from a variable in PHP

Question

I know this question sounds rather vague so I will make it more clear with an example    var    bar    bar   new   var Class  var for   construct         bar   new barClass  var for   construct        This is what I want to do  How would you do it  I could off course use eval   like this    var    bar   eval   bar   new    var  Class   var for   construct            But I d rather stay away from eval    Is there any way to do this without eval

User · Answer

If You Use Namespaces

In my own findings, I think it's good to mention that you (as far as I can tell) must declare the full namespace path of a class.

MyClass.php

namespace com\company\lib;
class MyClass {
}

index.php

namespace com\company\lib;

//Works fine
$i = new MyClass();

$cname = 'MyClass';

//Errors
//$i = new $cname;

//Works fine
$cname = "com\\company\\lib\\".$cname;
$i = new $cname;

User · Answer

I would recommend the call user func   or call user func arrayphp methods  You can check them out here  call user func array   call user func    example  class Foo   static public function test         print  Hello world  n         call user func  Foo  test     FOO is the class  test is the method both separated by       or  call user func array  Foo    test      alternatively you can pass the class and method as an array   If you have arguments you are passing to the method   then use the call user func array   function   example   class foo   function bar  arg   arg2        echo   METHOD      got  arg and  arg2 n           Call the  foo- gt bar   method with 2 arguments call user func array array  foo    bar    array  three    four       or   FOO is the class  bar is the method both separated by    call user func array  foo  bar    array  three    four

User · Answer

Put the classname into a variable first    classname  var  Class     bar new  classname  xyz      This is often the sort of thing you ll see wrapped up in a Factory pattern   See Namespaces and dynamic language features for further details

User · Answer

class Test       public function yo             return  yoes             var    Test     obj   new  var    echo  obj- gt yo      yoes

User · Answer

How to pass dynamic constructor parameters too  If you want to pass dynamic constructor parameters to the class  you can use this code    reflectionClass   new ReflectionClass  className     module    reflectionClass- gt newInstanceArgs  arrayOfConstructorParameters     More information on dynamic classes and parameters  PHP    5 6  As of PHP 5 6 you can simplify this even more by using Argument Unpacking      The       is part of the language and indicates an argument array to unpack   module   new  className     arrayOfConstructorParameters     Thanks to DisgruntledGoat for pointing that out

[php] instantiate a class from a variable in PHP?

If You Use Namespaces

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