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<?php declare(strict_types=1); function foo(string $bar = null) { var_dump($bar); } foo('bar'); foo(); foo(null); foo(1);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
string(3) "bar" NULL NULL Fatal error: Uncaught TypeError: foo(): Argument #1 ($bar) must be of type ?string, int given, called in /in/SrVEs on line 12 and defined in /in/SrVEs:5 Stack trace: #0 /in/SrVEs(12): foo(1) #1 {main} thrown in /in/SrVEs on line 5
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 string(3) "bar" NULL NULL Fatal error: Uncaught TypeError: foo(): Argument #1 ($bar) must be of type ?string, int given, called in /in/SrVEs on line 12 and defined in /in/SrVEs:5 Stack trace: #0 /in/SrVEs(12): foo(1) #1 {main} thrown in /in/SrVEs on line 5
Process exited with code 255.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
string(3) "bar" NULL NULL Fatal error: Uncaught TypeError: Argument 1 passed to foo() must be of the type string or null, int given, called in /in/SrVEs on line 12 and defined in /in/SrVEs:5 Stack trace: #0 /in/SrVEs(12): foo(1) #1 {main} thrown in /in/SrVEs on line 5
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33
string(3) "bar" NULL NULL Fatal error: Uncaught TypeError: Argument 1 passed to foo() must be of the type string or null, integer given, called in /in/SrVEs on line 12 and defined in /in/SrVEs:5 Stack trace: #0 /in/SrVEs(12): foo(1) #1 {main} thrown in /in/SrVEs on line 5
Process exited with code 255.
Output for 7.0.0 - 7.0.20
string(3) "bar" NULL NULL Fatal error: Uncaught TypeError: Argument 1 passed to foo() must be of the type string, integer given, called in /in/SrVEs on line 12 and defined in /in/SrVEs:5 Stack trace: #0 /in/SrVEs(12): foo(1) #1 {main} thrown in /in/SrVEs on line 5
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Warning: Unsupported declare 'strict_types' in /in/SrVEs on line 3 Catchable fatal error: Argument 1 passed to foo() must be an instance of string, string given, called in /in/SrVEs on line 9 and defined in /in/SrVEs on line 5
Process exited with code 255.

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