Online PHP editor | output for C6UNl

Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Deprecated: foo implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary) in /in/C6UNl on line 3 Fatal error: Uncaught Error: Call to undefined function Exception() in /in/C6UNl:9 Stack trace: #0 [internal function]: foo->serialize() #1 /in/C6UNl(17): serialize(Object(foo)) #2 {main} thrown in /in/C6UNl on line 9
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30: Fatal error: Uncaught Error: Call to undefined function Exception() in /in/C6UNl:9 Stack trace: #0 [internal function]: foo->serialize() #1 /in/C6UNl(17): serialize(Object(foo)) #2 {main} thrown in /in/C6UNl on line 9
Process exited with code 255.
Output for 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 - 5.6.40: Fatal error: Call to undefined function Exception() in /in/C6UNl on line 9
Process exited with code 255.
Output for 5.0.5: Fatal error: Interface 'Serializable' not found in /in/C6UNl on line 3
Process exited with code 255.
Output for 5.0.0 - 5.0.4: Fatal error: Class 'Serializable' not found in /in/C6UNl on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/C6UNl on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_STRING, expecting '{' in /in/C6UNl on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `'{'' in /in/C6UNl on line 3
Process exited with code 255.