php71-switch-constant-bug.php

<?php
// execute with PHP 7.1.0 CGI

class Lexer
{
    // All tokens that are not valid identifiers must be < 100
    const T_NONE = 1;
    const T_STRING = 2;
    const T_DOT = 8;

    /**
     * Retrieve token type. Also processes the token value if necessary.
     *
     * @param string $value
     * @return int
     */
    protected function getType($value): int
    {
        $type = self::T_NONE;

        switch (true) {
            // Recognize identifiers, aliased or qualified names
            case ctype_alpha($value[0]):
                $name = 'Lexer::T_' . strtoupper($value);

                if (defined($name)) {
                    $type = constant($name);

                    if ($type > 100) {
                        return $type;
                    }
                }

                return self::T_STRING;

            // Recognize symbols
            case $value === '.':
                return self::T_DOT;
            // Default
            default:
                // Do nothing
        }

        return $type;
    }
}

new Lexer();

nic work