Online PHP editor | output for 7kG4D

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: Fatal error: Uncaught TypeError: Unsupported operand types: string & int in /in/7kG4D:5 Stack trace: #0 [internal function]: {closure}('first') #1 /in/7kG4D(5): array_filter(Array, Object(Closure)) #2 {main} thrown in /in/7kG4D on line 5
Process exited with code 255.
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 Fatal error: Uncaught TypeError: Unsupported operand types: string & int in /in/7kG4D:5 Stack trace: #0 [internal function]: {closure}('first') #1 /in/7kG4D(5): array_filter(Array, Object(Closure)) #2 {main} thrown in /in/7kG4D on line 5
Process exited with code 255.
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: A non-numeric value encountered in /in/7kG4D on line 5 Warning: A non-numeric value encountered in /in/7kG4D on line 5 Warning: A non-numeric value encountered in /in/7kG4D on line 5 Warning: A non-numeric value encountered in /in/7kG4D on line 5 Warning: A non-numeric value encountered in /in/7kG4D on line 6 Warning: A non-numeric value encountered in /in/7kG4D on line 6 Warning: A non-numeric value encountered in /in/7kG4D on line 6 Warning: A non-numeric value encountered in /in/7kG4D on line 6 Warning: array_combine(): Both parameters should have an equal number of elements in /in/7kG4D on line 8 bool(false)
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33: Warning: array_combine(): Both parameters should have an equal number of elements in /in/7kG4D on line 8 bool(false)