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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).
How can I create readonly properties of my own in PHP?
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Read only means that we can access the value of a property but we can't assign a value to it. When a property does not have a set accessor then it is a read only property. For example in the person class we have a Gender property that has only a get accessor and doesn't have a set accessor.
You can use mapping modifiers to change a readonly property to mutable in TypeScript, e.g. -readonly [Key in keyof Type]: Type[Key] . You can remove the readonly modifier by prefixing the readonly keyword with a minus - .
Within class methods non-static properties may be accessed by using -> (Object Operator): $this->property (where property is the name of the property). Static properties are accessed by using the :: (Double Colon): self::$property .
You can do it like this:
class Example { private $__readOnly = 'hello world'; function __get($name) { if($name === 'readOnly') return $this->__readOnly; user_error("Invalid property: " . __CLASS__ . "->$name"); } function __set($name, $value) { user_error("Can't set property: " . __CLASS__ . "->$name"); } } Only use this when you really need it - it is slower than normal property access. For PHP, it's best to adopt a policy of only using setter methods to change a property from the outside.
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