array_key_exists:
a: found
b: found
isset:
a: found
b: not found
empty:
a: not found
b: found
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
array_key_exists:
a: found
b: found
isset:
a: found
b: not found
empty:
a: not found
b: found