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run code in 300+ PHP versions simultaneously
<?php ob_start(function($buffer) { return print_r(debug_backtrace(), true); }); ob_implicit_flush(true); echo 'foo'; echo 'bar';
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => Array ( [function] => {closure} [args] => Array ( [0] => foobar [1] => 9 ) ) )

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