Online PHP editor | output for eR6OM

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: Warning: ref(): Argument #1 ($a) must be passed by reference, value given in /in/eR6OM on line 10 int(1) Warning: ref(): Argument #1 ($a) must be passed by reference, value given in /in/eR6OM on line 10 int(1)
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Warning: ref(): Argument #1 ($a) must be passed by reference, value given in /in/eR6OM on line 10 int(1) Warning: ref(): Argument #1 ($a) must be passed by reference, value given in /in/eR6OM on line 10 int(1)
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: Warning: Parameter 1 to ref() expected to be a reference, value given in /in/eR6OM on line 10 int(1) Warning: Parameter 1 to ref() expected to be a reference, value given in /in/eR6OM on line 10 int(1)
Output for 7.0.0 - 7.0.20: int(1) Warning: Parameter 1 to ref() expected to be a reference, value given in /in/eR6OM on line 10
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.24: Warning: Parameter 1 to ref() expected to be a reference, value given in /in/eR6OM on line 10 Warning: Parameter 1 to ref() expected to be a reference, value given in /in/eR6OM on line 10
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/eR6OM on line 6
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, 5.0.0 - 5.0.5: Parse error: parse error, unexpected '[' in /in/eR6OM on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/eR6OM on line 6
Process exited with code 255.