PHP 8.5: First Class Callables in Constant Expressions

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PHP 8.5: Closures in Constant Expressions

PHP 8.5: Pipe Operator

<?php
final class LogEntry
{
    public string $message;

    #[\Serialize\Custom(self::myMethod(...))]
    public string $severity;
}
?>

• They must be free-standing functions or static methods
• Forbidden: __callStatic() methods
• Forbidden: [ClassName::class, 'methodName'](...)