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object is the same as className

Posted on 2014-04-28
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Last Modified: 2014-04-29
<?php
class HelloWorld{
  public function sayHelloTo($name){
    return 'Hello '.$name;
  }
}

$obj=new HelloWorld();
//$reflectionMethod=new ReflectionMethod('HelloWorld','sayHelloTo');
$reflectionMethod=new ReflectionMethod($obj,'sayHelloTo');
echo $reflectionMethod->invoke(new HelloWorld(),'Mike');

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please explain why
//$reflectionMethod=new ReflectionMethod('HelloWorld','sayHelloTo');
$reflectionMethod=new ReflectionMethod($obj,'sayHelloTo');

are the same
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Question by:rgb192
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5 Comments
 
LVL 58

Expert Comment

by:Julian Hansen
ID: 40028894
The answer is in the documentation for ReflectionMethod
http://www.php.net/manual/en/reflectionmethod.construct.php
 class
    Classname or object (instance of the class) that contains the method.

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In other words the constructor for the Reflection method can take either

- The name of a class
OR
- An already instantiated (object) instance of a class
The commented out line above does the former - it passes the class name in as a string. The ReflectionMethod constructor recognises it is a string and will automatically create an object of that class type.
If it is an object (as in the second line) then it will simply use that object.
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Author Comment

by:rgb192
ID: 40029764
Ok so in all the examples of php: is 'className' same as $obj?
Or is the reflection documentation saying it will take either
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LVL 58

Accepted Solution

by:
Julian Hansen earned 2000 total points
ID: 40029851
Ok so in all the examples of php: is 'className' same as $obj?
No definitely not
What the code is doing is probably something like this
public ReflectionMethod::__construct ( mixed $class , string $name )
{
    // CHECK IF $class IS AN OBJECT
    if (!is_object($class)) {
       // IF NOT CHECK IF A CLASS EXISTS WITH NAME $class
       if (class_exists($class)) {
          // IF SO INSTANTIATE IT
          $obj = new {$class};
       }
       else {
          //THROW AN ERROR HERE - class not found
       }
    }
    // IF $class IS AN OBJECT THEN JUST ASSIGN IT
    else {
       $obj = $class;
    }
}

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The above is just an illustration - I cannot confirm if the actual code follows this pattern. The point being that in PHP there is a distinction between a class name and an instance of the class - you cannot use them interchangeably.
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Author Closing Comment

by:rgb192
ID: 40029896
Thanks for example of what is in reflection class
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LVL 58

Expert Comment

by:Julian Hansen
ID: 40029946
You are welcome - thanks for the points.
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