Online PHP editor | output for lGbKp

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: Undefined variable $echo in /in/lGbKp on line 12 Fatal error: Uncaught Error: Value of type null is not callable in /in/lGbKp:12 Stack trace: #0 {main} thrown in /in/lGbKp on line 12
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.33: Notice: Undefined variable: echo in /in/lGbKp on line 12 Fatal error: Uncaught Error: Function name must be a string in /in/lGbKp:12 Stack trace: #0 {main} thrown in /in/lGbKp on line 12
Process exited with code 255.
Output for 7.3.32 - 7.3.33: Fatal error: Uncaught Error: Function name must be a string in /in/lGbKp:12 Stack trace: #0 {main} thrown in /in/lGbKp on line 12
Process exited with code 255.
Output for 5.0.4 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28: Notice: Undefined variable: echo in /in/lGbKp on line 12 Fatal error: Function name must be a string in /in/lGbKp on line 12
Process exited with code 255.
Output for 5.0.0 - 5.0.3: Notice: Undefined variable: echo in /in/lGbKp on line 12 Fatal error: Function name must be a string in /in/lGbKp on line 12
Process exited with code 255.
Output for 4.4.5 - 4.4.9: Notice: Undefined variable: echo in /in/lGbKp on line 12 Fatal error: Call to undefined function: () in /in/lGbKp on line 12
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4: Notice: Undefined variable: echo in /in/lGbKp on line 12 Fatal error: Call to undefined function: () in /in/lGbKp on line 12
Process exited with code 255.
Output for 4.3.0 - 4.3.1: Notice: Undefined variable: echo in /in/lGbKp on line 12 Fatal error: Call to undefined function: () in /in/lGbKp on line 12