Question

I am Studying PHP, OOP and i have learned a lot, but there is small things who tease me,

There is an image I created for illustration of object creation:Link

if someone could answer a few questions please…

• I will be happy if some one can correct me if i did something wrong with the image.
• When i try to echo an object i getting an error that say that the Object
  (i understand that the Object is the memory reference) cannot be converted to a string, if its not a string of the memory location name(example: ‘F70’) can i have an example please for how does memory location looks like.
• And about the variable containing the reference, i understand that this is a regular variable placed with all the rest of the global variables, i mean that if i create new object and a new variable the first object(variable) contain the reference but it is a regular global variable, same is the other variable:

First Step: i define the object variable…

Second Step: the Object created and it memory location getting inside the variable we wanted…

Third Step: New global variable created with our reference.

What mean that when i call a Object(variable):

First Step: We are going to the memory location where our variable created…

Second Step: The Variable value(reference) referring us to the memory location where the object is…

Third Step: We have access to methods and properties of that object.

I will be happy if some one can help me understand this things, thank you all and have a nice day.

Answer 1

1. To have a string representation of an object you have to implement function __toString()

2. Regarding internal mechanisms – its a lot lot more complicated than you think. As PHP is a dynamic language – it haas to keep a lot of information for every class, for every class object. Not just memory needed for string variable, but also function mapping, memory management structures, types structures, defaults..
   If you want to get deeper, read this