PHP system functions and operators related to classes and objects

System function

• class_exists()
  Determine whether a class exists
• interface_exists()
  Determine whether the interface exists
• get_class()
  Get the class name of an object
• get_parent_class()
  Get the class name of the parent class to which an object belongs
• get_class_methods()
  Get all methods of a class and return the index array
• get_class_vars()
  Get all attributes of a class, the subscript is the attribute name
• get_declared_classes()
  Get all declared classes (including system classes)
• is_object()
  Determine whether it is an object
• get_object_vars()
  Get all the attributes of the object and return an array. The subscript is the attribute name

operator

• new
• instanceOf determines whether an object is an instance of a certain class (including inheritance)

<code><span><span>class</span><span>bee</span>{</span>}
<span>$o</span> = <span>new</span> bee();
<span>if</span>(<span>$o</span><span>instanceOf</span> bee){
    <span>echo</span><span>'true'</span>;
}</code>

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The above has introduced the system functions and operators of PHP classes and objects, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.