briefly describe the following methods, PHP Object Oriented Programming, PHP

Question:Briefly describe the following methods:
class_exists()
is_a()
is_subclass_of()
method_exists()
interface_exists()
get_parent_class()

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Briefly describe the following methods:

class_exists()
is_a()
is_subclass_of()
method_exists()
interface_exists()
get_parent_class()

Question:Briefly describe the following methods:class_exists()is_a()is_subclass_of()method_exists()interface_exists()get_parent_class()

Answer Coming soon...

Question:
Briefly describe the following methods:
class_exists()
is_a()
is_subclass_of()
method_exists()
interface_exists()
get_parent_class()