Online PHP editor | output for ImieA

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: Undefined variable $b in /in/ImieA on line 4 Fatal error: Uncaught TypeError: array_diff_key(): Argument #2 must be of type array, null given in /in/ImieA:4 Stack trace: #0 /in/ImieA(4): array_diff_key(Array, NULL) #1 {main} thrown in /in/ImieA on line 4
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 Warning: Undefined variable $b in /in/ImieA on line 4 Fatal error: Uncaught TypeError: array_diff_key(): Argument #2 must be of type array, null given in /in/ImieA:4 Stack trace: #0 /in/ImieA(4): array_diff_key(Array, NULL) #1 {main} thrown in /in/ImieA on line 4
Process exited with code 255.
Output for 7.3.12 - 7.3.31, 7.4.0 - 7.4.33: Notice: Undefined variable: b in /in/ImieA on line 4 Warning: array_diff_key(): Expected parameter 2 to be an array, null given in /in/ImieA on line 4
Output for 7.3.32 - 7.3.33: Warning: array_diff_key(): Expected parameter 2 to be an array, null given in /in/ImieA on line 4
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, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33: Notice: Undefined variable: b in /in/ImieA on line 4 Warning: array_diff_key(): Argument #2 is not an array in /in/ImieA on line 4
Output for 5.0.0 - 5.0.5: Fatal error: Call to undefined function array_diff_key() in /in/ImieA on line 4
Process exited with code 255.
Output for 4.4.5 - 4.4.9: Fatal error: Call to undefined function: array_diff_key() in /in/ImieA on line 4
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: array_diff_key() in /in/ImieA on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1: Fatal error: Call to undefined function: array_diff_key() in /in/ImieA on line 4