Online PHP editor | output for kU6Yr

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7: "" == 0 ==> Fatal error: Uncaught Error: Undefined constant "e" in /in/kU6Yr:3 Stack trace: #0 {main} thrown in /in/kU6Yr on line 3
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33: "" == 0 ==> Warning: Use of undefined constant e - assumed 'e' (this will throw an Error in a future version of PHP) in /in/kU6Yr on line 3 Parse error: syntax error, unexpected end of file in /in/kU6Yr(3) : eval()'d code on line 1
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20: "" == 0 ==> Notice: Use of undefined constant e - assumed 'e' in /in/kU6Yr on line 3 Parse error: syntax error, unexpected end of file in /in/kU6Yr(3) : eval()'d code on line 1
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28: "" == 0 ==> Notice: Use of undefined constant e - assumed 'e' in /in/kU6Yr on line 3 Parse error: syntax error, unexpected end of file in /in/kU6Yr(3) : eval()'d code on line 1 bool(false) 0 == "" ==> Notice: Use of undefined constant e - assumed 'e' in /in/kU6Yr on line 3 Parse error: syntax error, unexpected end of file in /in/kU6Yr(3) : eval()'d code on line 1 bool(false) "" == "0" ==> Notice: Use of undefined constant e - assumed 'e' in /in/kU6Yr on line 3 Parse error: syntax error, unexpected end of file in /in/kU6Yr(3) : eval()'d code on line 1 bool(false) "0" == "" ==> Notice: Use of undefined constant e - assumed 'e' in /in/kU6Yr on line 3 Parse error: syntax error, unexpected end of file in /in/kU6Yr(3) : eval()'d code on line 1 bool(false) "" == null ==> Notice: Use of undefined constant e - assumed 'e' in /in/kU6Yr on line 3 Parse error: syntax error, unexpected end of file in /in/kU6Yr(3) : eval()'d code on line 1 bool(false) null == "" ==> Notice: Use of undefined constant e - assumed 'e' in /in/kU6Yr on line 3 Parse error: syntax error, unexpected end of file in /in/kU6Yr(3) : eval()'d code on line 1 bool(false)