3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Test { public string $Content–Type = "world"; } echo json_encode(new Test), PHP_EOL, json_encode(["Content-Type" => "world"]);
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
{"Content\u2013Type":"world"} {"Content-Type":"world"}
preferences:
54.95 ms | 984 KiB | 4 Q