<?php
function NC($x){
$y = array();
$y['test'] = $x;
$returnThis = $y['test'] ?? "Foo";
return $returnThis;
}
NC(NULL); // I know this will return "Foo".
/* But I have no clue about what these will return. */
var_dump(NC(0));
var_dump(NC(-1));
var_dump(NC(""));
var_dump(NC(array()));
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
int(0)
int(-1)
string(0) ""
array(0) {
}