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<?php function f(int $i){} var_dump( (int)null ); // casting null to int works fine f('1'); // string is coerced fine f(null); // null is not coerced at all
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0
int(0) Fatal error: Uncaught TypeError: f(): Argument #1 ($i) must be of type int, null given, called in /in/mkr9a on line 7 and defined in /in/mkr9a:3 Stack trace: #0 /in/mkr9a(7): f(NULL) #1 {main} thrown in /in/mkr9a on line 3
Process exited with code 255.
Output for 8.4.15
/bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
int(0) Fatal error: Uncaught TypeError: Argument 1 passed to f() must be of the type int, null given, called in /in/mkr9a on line 7 and defined in /in/mkr9a:3 Stack trace: #0 /in/mkr9a(7): f(NULL) #1 {main} thrown in /in/mkr9a on line 3
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33
int(0) Fatal error: Uncaught TypeError: Argument 1 passed to f() must be of the type integer, null given, called in /in/mkr9a on line 7 and defined in /in/mkr9a:3 Stack trace: #0 /in/mkr9a(7): f(NULL) #1 {main} thrown in /in/mkr9a on line 3
Process exited with code 255.
Output for 5.6.0 - 5.6.27
int(0) Catchable fatal error: Argument 1 passed to f() must be an instance of int, string given, called in /in/mkr9a on line 6 and defined in /in/mkr9a on line 3
Process exited with code 255.

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