• Can I define a method called 'empty' inside a class?
• How do I reference a variable that is defined inside a class?
• Can I string together object references, eg: $foo->bar()->try() ?
• Can I use include or require inside a class definition?
• Can I put include or require inside a class definition?
• How does PHP handle arrays of objects?
• Can I return a value from a class constructor?
• How can I call a polymorphed parent function?
• I have a subclass with method foo(), can I call foo() in the parent?
• How can I serialize a class in PHP?
• Can I make an assignment to $this in a class method?
• How can I return an error from a class constructor?
• Does PHP have multiple inheritence?
• Can a class have two parents?
• How can I tell if a class is defined?
• How can I call an ancestor's constructor method?
• What happens when I cast an object as an array?
• How do I get a list of object properties?
• How can I get the class name of an object?
• Is it bad PHP style to set an object variable directly?
• Should I write get and set methods for my objects?
• Can PHP do "reference" but not "copy" on variables in classes?
• Can I store an array of objects as an object variable?
• How can i acess a variable inside a class that was declared in other module(included by require/include) ?
• How do I call a class method from array_walk? e.g. array_walk( fruits, "$this->print_array" ); - does not work.
• How can I use a global variable inside a class?
• how to access an object variable using a variable variable e.g. object->var_a but "_a" should be read from a str. which instead could contain "_b"
• Does PHP surpport override and polymorphism?
• Know of any basic tutorials on PHP Classes and OOP?
• Does PHP have a garbage collector? or how do I release the Memory when I have done with my object ?
• How do you pass an instance of an object between pages in PHP?
• How do I call the parent's constructor without knowing the class name of the parent?
• Are PHP Class variable declarations necessary?
• Is there a tool to document your classes, similar to Javadoc in Java?
• Can I use a class from within a function?
• $this and $that
• Does the object get passed by value or by reference?

Unanswered Questions

• How can I improve performance when using multiple class files?
• Can you make an Instance of One Class(FuelTank) a data member of another Class(Vehicle) in PHP4? i.e. class Vehicle{ oneLitreFuelTank=new FuelTank;}
• What would cause the inability to access class variables from objects created with the "new classname" method?
• How to get the class instance name, so that "$this->a_method" could be passed as a variable function?
• Why does parent:: not work across source file boundaries?
• What is cfunction? It's in the samples, but undocumented!
• How can I use variables (from outside a class), inside a class to build a dynamic constructor!
• How can I chain an object with an other object of the same class
• How can I something like that: if($exp){ class foo extends my1} else {class foo extends my2} ?
• How define a class A with a var of type B, where class B contains a var of type A
• I can't access class properties with register_shutdown_function.
• Can I assign multiple classes to one variable while maintaining all class methods and functions?
• searching for elegant fix to the single inheritance limitation, parents can't extend eachother
• Can an object property itself be an object? How do you use them?
• How do I set the values stored in an objects array via form fields? ie What do I assign "name"
• is it possible to have user defined classes or data structures in PHP ?
• Are classes in PHP efficient during run-time, vs conditional includes of standard code blocks?
• Static Abstract Class Not Possible?
• How can I get the names of all subobjects of an object?
• Where can I find detailed information concerning multiple instances of a base class?
• How to cast a class object in to an array & get that class's properties ?
• How to cast a class object in to an array & get that class's properties ?
• How to cast a class object in to an array & get that class's properties ?
• How can i call a class object if it is loaded in other page?
• how can i define a friend class for given class?(like in c++)
• How can I split a large (6 MB) class into several files to ease the maintaining process?
• When passing a object between pages is it passed by value or by reference?
• PHP give me a fatal error when the script try to create a NEW instance of a class salved in \PHP5\p