<?php
function f(int $i){}
var_dump( (int)null ); // casting null to int works fine
f('1'); // string is coerced fine
f(null); // null is not coerced at all
int(0)
Fatal error: Uncaught TypeError: f(): Argument #1 ($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 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.
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.