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Accessing a public property of an object in PHP requires using the object operator, which is represented by "->". This operator allows you to reference properties and methods of an object that you have instantiated from a class.

In PHP, when you create an object from a class, you can directly access its public properties using this operator followed by the property name. For example, if you have an object called `$object` and a public property called `propertyName`, you would access it using `$object->propertyName`. This syntax clearly shows the relationship between the object and its properties, making it straightforward to read and understand.

Using other methods, such as trying to access the property with a dot operator or through square brackets, would not be valid in PHP, as the language does not support those syntaxes for object property access. Additionally, calling a method on the object is a different approach and does not directly access the property itself, but rather executes a function that could potentially return the property value. Hence, the correct understanding of property access is pivotal for effective use of object-oriented programming in PHP.