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<?php $str = 'holger@hütig.de'; $d = array($str); $json = json_encode($d); $serialized = serialize($json); $b64 = base64_encode($serialized); $escaped = escapeshellarg($b64); var_dump($str, strtolower($str));
Output for git.master, git.master_jit, rfc.property-hooks
string(16) "holger@hütig.de" string(16) "holger@hütig.de"

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