Fatal error: Uncaught TypeError: strtotime(): Argument #2 ($baseTimestamp) must be of type ?int, string given in /in/qKF8q:3
Stack trace:
#0 /in/qKF8q(3): strtotime('2015-10-10', '+ 1 month')
#1 {main}
thrown in /in/qKF8q on line 3
Process exited with code 255.
Output for 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: strtotime() expects parameter 2 to be int, string given in /in/qKF8q on line 3
1970-01-01