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run code in 300+ PHP versions simultaneously

@ 2015-12-11T16:23:30Z

<?php

namespace A {
    class T {}
}

namespace
{
    class Test
    {
        public function first(string $str) : Closure
        {
            /* closure with return type declaration and use() clause */
            $tmp = function() use ($str) : int {
                return strlen($str);
            };
            return $tmp;
        }

        public function second() : self
        {
            return $this;
        }
    }

    class SubTest extends Test
    {
        public function third() : parent
        {
            return $this;
        }

        /* returning a namespace-qualified type */
        public function fourth() : \A\T
        {
            return new \A\T;
        }

        /* spaces are allowed around elements of the namespace */
        public function fifth() : \ A \ T
        {
            return $this->fourth();
        }

        public function &sixth(\A\T &$t) : \A\T
        {
            return $t;
        }
    }

    /* runtime test */
    $s = new SubTest;
    $t = $s->third();
    var_dump(($t->second()->first("hello"))());
    var_dump($s->fourth());
    var_dump($s->fifth());
    var_dump($s->sixth($s->fourth()));
}

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Parse error: syntax error, unexpected token "\" in /in/Sk0hc on line 40
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33: int(5) object(A\T)#2 (0) { } object(A\T)#2 (0) { } Notice: Only variables should be passed by reference in /in/Sk0hc on line 57 object(A\T)#2 (0) { }
Output for 7.3.32 - 7.3.33: int(5) object(A\T)#2 (0) { } object(A\T)#2 (0) { } object(A\T)#2 (0) { }
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28: Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/Sk0hc on line 11
Process exited with code 255.

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