3v4l.org

run code in 500+ PHP versions simultaneously
<?php class X { function __get($name) { return 'a'; } // The important part is // that function __isset() is missing } $x = new X(); var_dump(isset($x->a)); // false var_dump(!empty($x->a)); // false // With var_dump($x->a === null); // false var_dump($x->a == ''); // false

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).

VersionSystem time (s)User time (s)Memory (MiB)
8.5.30.0260.00516.31
8.4.90.0100.01017.85
8.3.180.0060.00816.74
8.3.50.0090.00916.74
preferences:
53.22 ms | 507 KiB | 4 Q