Online PHP editor | output for 4cnLO

Output for 5.2.0 - 5.2.8, 5.2.14 - 5.2.17, 5.3.3 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 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: bool(false) string(24) "dotty@something.whatever"
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 bool(false) string(24) "dotty@something.whatever"
Output for 5.2.9 - 5.2.13, 5.3.0 - 5.3.2: string(28) "nonsense.something@dottiness" string(24) "dotty@something.whatever"
Output for 5.0.0 - 5.0.5, 5.1.1 - 5.1.6: Fatal error: Call to undefined function filter_var() in /in/4cnLO on line 6
Process exited with code 255.
Output for 5.1.0: Fatal error: fatal flex scanner internal error--end of buffer missed in /in/4cnLO on line 7
Process exited with code 255.
Output for 4.4.5 - 4.4.9: Fatal error: Call to undefined function: filter_var() in /in/4cnLO on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4: Fatal error: Call to undefined function: filter_var() in /in/4cnLO on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1: Fatal error: Call to undefined function: filter_var() in /in/4cnLO on line 6