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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
{"Content\u2013Type":"world"} {"Content-Type":"world"}
preferences:
75.8 ms | 406 KiB | 5 Q