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<?php class IsolatedTest { protected $closure; public function __construct($closure) { $this->closure = $closure; } public function __invoke() { call_user_func($this->closure); } } class Test { public function testing(callable $what) { return Closure::bind($what, $this, $this); } } $test = new IsolatedTest(function () { echo 'This can be forked and called.'; }); $more = (new Test)->testing($test); var_dump($more);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: Closure::bind(): Argument #1 ($closure) must be of type Closure, IsolatedTest given in /in/usUfQ:22 Stack trace: #0 /in/usUfQ(22): Closure::bind(Object(IsolatedTest), Object(Test), Object(Test)) #1 /in/usUfQ(30): Test->testing(Object(IsolatedTest)) #2 {main} thrown in /in/usUfQ on line 22
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: Closure::bind() expects parameter 1 to be Closure, object given in /in/usUfQ on line 22 NULL
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /in/usUfQ on line 30
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/usUfQ on line 26
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION, expecting ')' in /in/usUfQ on line 26
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/usUfQ on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/usUfQ on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/usUfQ on line 5
Process exited with code 255.
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