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run code in 300+ PHP versions simultaneously
<html> <?php /* これはエラーとなります。この上に出力があることに注目してください。 * それはheader()のコールより前であるということになります */ header('Location: http://www.example.com/'); exit; ?>
Output for git.master, git.master_jit, rfc.property-hooks
<html> Warning: Cannot modify header information - headers already sent by (output started at /in/qpdHr:1) in /in/qpdHr on line 5

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