Web Reference: Jun 2, 2021 · A readonly property can only be initialized once, and only from the scope where it has been declared. Any other assignment or modification of the property will result in an Error exception. In using PHP's DOM classes (DOMNode, DOMEElement, etc) I have noticed that they possess truly readonly properties. For example, I can read the $nodeName property of a DOMNode, but I cannot write to it (if I do PHP throws a fatal error). The readonly properties allow you to define properties that can be only initialized once within the class. To define a readonly property, you use the readonly keyword in a typed property:
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