Cast In Const

<?php

class X {
    const T = (int) 1.73;
    // Fatal error
    //const U = (object) [];
}

echo X::T; //

TIL that constant values accepts casting since PHP 8.5. It is possible to cast a value to another type when defining the global or class constant.

This might be most useful when a constant must be available in several flavor, rather than with literal values.

The only cast that is not supported is (object).

See Also

• cast in constant [Try me]

PHP Error Messages

• Object casts are not supported in this context

PHP Features

• cast
• constant
• class-constant
• static-expression

Last updated: 10 September 2026