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run code in 200+ php & hhvm versions
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<?php $sMsgId = date('YmdHis').str_pad('13913938335652', 4, '0', STR_PAD_LEFT); echo '<pre>'; var_dump($sMsgId); echo '</pre>';
Output for 4.3.0 - 7.2.0
<pre>string(28) "2014020303182713913938335652" </pre>