Online PHP editor | output for GkVNU

Output for 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: fopen(): open_basedir restriction in effect. File(a&b) is not within the allowed path(s): (/tmp:/in:/etc) fopen(a&b): Failed to open stream: Operation not permitted Undefined array key "<>"
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 fopen(): open_basedir restriction in effect. File(a&b) is not within the allowed path(s): (/tmp:/in:/etc) fopen(a&b): Failed to open stream: Operation not permitted Undefined array key "<>"
Output for 8.0.13: fopen(a&b): Failed to open stream: No such file or directory Undefined array key "<>"
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 7.3.32, 7.4.26, 7.4.33: fopen(a&b): failed to open stream: No such file or directory Undefined index: <>
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.31, 7.3.33, 7.4.0 - 7.4.25, 7.4.27 - 7.4.32: fopen(): open_basedir restriction in effect. File(a&b) is not within the allowed path(s): (/tmp:/in:/etc) fopen(a&b): failed to open stream: Operation not permitted Undefined index: <>
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: fopen(a&b): failed to open stream: No such file or directory Undefined index: <>
Output for 4.3.0 - 4.3.1: fopen(a&b) [http://www.php.net/function.fopen]: failed to create stream: No such file or directory Undefined index: <>