<?php
class A {
public static $i;
public function test(&$arr) {
var_dump(self::$i);
if (!isset(self::$i)) {
self::$i = &$arr[0];
}
}
}
$arr = [1, 2, 3];
$a = new A();
$a->test($arr);
$a->test($arr);
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
NULL
int(1)