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run code in 300+ PHP versions simultaneously
<?php if (@readfile('/foo') === false) { echo "foo"; } header('HTTP/1.1 404 Not Found');
Output for git.master, git.master_jit, rfc.property-hooks
foo Warning: Cannot modify header information - headers already sent by (output started at /in/3B28W:4) in /in/3B28W on line 6

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