Online PHP editor | output for IKDF0

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Warning: A non-numeric value encountered in /in/IKDF0 on line 2 Warning: A non-numeric value encountered in /in/IKDF0 on line 2 int(-4) Fatal error: Uncaught TypeError: round(): Argument #1 ($num) must be of type int|float, string given in /in/IKDF0:3 Stack trace: #0 /in/IKDF0(3): round('6,90') #1 {main} thrown in /in/IKDF0 on line 3
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33: Notice: A non well formed numeric value encountered in /in/IKDF0 on line 2 Notice: A non well formed numeric value encountered in /in/IKDF0 on line 2 int(-4) float(6) Fatal error: Uncaught Error: Call to undefined function int() in /in/IKDF0:4 Stack trace: #0 {main} thrown in /in/IKDF0 on line 4
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.3.32 - 7.3.33: int(-4) float(6) Fatal error: Uncaught Error: Call to undefined function int() in /in/IKDF0:4 Stack trace: #0 {main} thrown in /in/IKDF0 on line 4
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40: int(-4) float(6) Fatal error: Call to undefined function int() in /in/IKDF0 on line 4
Process exited with code 255.