Cannot indirectly modify readonly

The same error message ‘Cannot indirectly modify readonly property X::$property’ is used when trying to sneak a reference on a readonly property, and updated it later.

Strangely, this is also the same error message when the readonly property is initially assigned a reference, for later sneaky update.

The error is the same, indeed, yet may be these messages may be distinct.

See Also

• Properties (PHP manual)

• Sneaky readonly [Try me]

PHP Error Messages

• Cannot indirectly modify readonly property %s::$%s

PHP Features

• readonly

• reference