3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { public function & bar() { return $this->var = $var = $this->baz(); } public function baz() { return 'hello'; } } $foo = new Foo(); $var = $foo->bar(); var_dump($var);
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Deprecated: Creation of dynamic property Foo::$var is deprecated in /in/VW9aB on line 9 Notice: Only variable references should be returned by reference in /in/VW9aB on line 9 string(5) "hello"
Output for 5.3.0 - 5.3.29, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Notice: Only variable references should be returned by reference in /in/VW9aB on line 9 string(5) "hello"
Output for 7.3.32 - 7.3.33, 7.4.26
string(5) "hello"
Output for 5.5.0 - 5.5.38
Fatal error: Cannot return string offsets by reference in /in/VW9aB on line 9
Process exited with code 255.
Output for 5.4.0 - 5.4.45

Process exited with code 139.
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244.96 ms | 401 KiB | 405 Q