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<?php $a = array_reduce( array(), function ($id, $arg) { if (is_scalar($arg) || is_resource($arg)) { return $id.$arg; } return is_object($arg) ? spl_object_hash($arg) : serialize($arg); }, '' ); var_dump($a);
Output for git.master, git.master_jit, rfc.property-hooks
string(0) ""

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