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<?php var_dump(substr("foo", ""));
Output for 8.0.0alpha1 - beta1
Fatal error: Uncaught TypeError: substr(): Argument #2 ($start) must be of type int, string given in /in/WVfeg:3 Stack trace: #0 /in/WVfeg(3): substr('foo', '') #1 {main} thrown in /in/WVfeg on line 3
Process exited with code 255.
Output for 7.3.0 - 7.3.21, 7.4.0 - 7.4.9
Warning: substr() expects parameter 2 to be int, string given in /in/WVfeg on line 3 NULL
Output for 7.2.0 - 7.2.33
Warning: substr() expects parameter 2 to be integer, string given in /in/WVfeg on line 3 NULL