Web Reference: PHP 8.1 brings support for read-only class properties. A class property declared read-only is only allowed to be initialized once, and further changes to the property is not allowed. Read-only class properties are declared with the readonly keyword * in a typed property. 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). As of PHP 8.1.0, a property can be declared with the readonly modifier, which prevents modification of the property after initialization. Prior to PHP 8.4.0 a readonly property is implicitly private-set, and may only be written to from the same class.
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Php Readonly Properties In Version Net Worth 2026: Salary, Income & Wealth Net Worth & Biography
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Last Updated: April 10, 2026
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