3v4l.org

run code in 200+ PHP versions simultaneously
<?php function foo(string &$bar) { } class Foo { public function __toString() { return "Foo"; } } $foo = new Foo(); foo($foo); var_dump($foo);
Output for 7.0.0 - 7.4.2
string(3) "Foo"
Output for 5.2.0 - 5.6.40
Catchable fatal error: Argument 1 passed to foo() must be an instance of string, instance of Foo given, called in /in/77lov on line 13 and defined in /in/77lov on line 3
Process exited with code 255.
Output for 5.0.0 - 5.1.6
Fatal error: Class 'string' not found in /in/77lov on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting ')' in /in/77lov on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting ')' in /in/77lov on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/77lov on line 3
Process exited with code 255.