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run code in 300+ PHP versions simultaneously

@ 2018-04-02T13:50:09Z

<?php

namespace MyNamespace {
    class Numerical {
        public static function MyFunction() {
            echo 'Called ', __FUNCTION__, '!', PHP_EOL;
        }
    }
}

namespace AnotherNamespace {
    class ClassName {
        public static function foo($MethodName) {
            /**
             * Two backslashes because of \$ escapes to $ character and \\ escapes to «backslash» itself
             * @see http://php.net/manual/en/language.types.string.php
             * @see http://php.net/manual/en/language.variables.variable.php
             * @see http://php.net/manual/en/functions.variable-functions.php
             */
            $variable = "\\MyNamespace\\${MethodName}"; // Option one works. 
            $variable::MyFunction();
        }
        
        public static function bar($className) {
            ('\MyNamespace\\' . $className)::MyFunction(); // Option two works in php version >= 7.1
        }
    }
    
    ClassName::foo('Numerical');
    ClassName::bar('Numerical');
}

Output for 8.2.0 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7: Deprecated: Using ${var} in strings is deprecated, use {$var} instead in /in/cAk7W on line 20 Called MyFunction! Called MyFunction!
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Deprecated: Using ${var} in strings is deprecated, use {$var} instead in /in/cAk7W on line 20 Called MyFunction! Called MyFunction!
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28: Called MyFunction! Called MyFunction!

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