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<?php function foo(int $integer): int { return $integer; } var_dump(foo(1)); var_dump(foo("1")); var_dump(foo("a"));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
int(1) int(1) Fatal error: Uncaught TypeError: foo(): Argument #1 ($integer) must be of type int, string given, called in /in/kXoBL on line 7 and defined in /in/kXoBL:3 Stack trace: #0 /in/kXoBL(7): foo('a') #1 {main} thrown in /in/kXoBL on line 3
Process exited with code 255.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
int(1) int(1) Fatal error: Uncaught TypeError: Argument 1 passed to foo() must be of the type int, string given, called in /in/kXoBL on line 7 and defined in /in/kXoBL:3 Stack trace: #0 /in/kXoBL(7): foo('a') #1 {main} thrown in /in/kXoBL on line 3
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
int(1) int(1) Fatal error: Uncaught TypeError: Argument 1 passed to foo() must be of the type integer, string given, called in /in/kXoBL on line 7 and defined in /in/kXoBL:3 Stack trace: #0 /in/kXoBL(7): foo('a') #1 {main} thrown in /in/kXoBL on line 3
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected ':', expecting '{' in /in/kXoBL on line 3
Process exited with code 255.

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