Web Reference: Jun 2, 2021 · This RFC introduces a readonly property modifier, which prevents modification of the property after initialization. Value objects are often immutable: Properties are initialized once in the constructor, and should not be modified afterwards. 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: If a variable is not meant to be edited directly despite being public, PHP-programmers often use the convention $pleaseTouch versus $_doNotTouch to signal whether a given property should be relied upon externally versus not.
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