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<?php function foo(bool $b) { return $b; } var_dump(foo('')); var_dump('foo' == (bool) 'foo');
based on 5du96
Output for 7.0.0 - 7.2.0
bool(false) bool(true)
Output for 5.3.19 - 5.6.21
Catchable fatal error: Argument 1 passed to foo() must be an instance of bool, string given, called in /in/cMfno on line 7 and defined in /in/cMfno on line 3
Process exited with code 255.