3v4l.org

run code in 500+ 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 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
{"Content\u2013Type":"world"} {"Content-Type":"world"}
preferences:
67.15 ms | 1016 KiB | 4 Q