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获取字符串第一个原点之前的内容吗，下面的例子：
$str='www.lizhenqiu.com'; list($dom)=explode('.',$str);
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    <?php $my_array = array("Dog","Cat","Horse"); list($a, $b, $c) = $my_array; echo "I have several animals, a $a, a $b and a $c."; ?>
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      <?php $my_array = array("Dog","Cat","Horse"); list($a, , $c) = $my_array; echo "Here I only use the $a and $c variables."; ?>
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        <?php $domain = "www.lizhenqiu.com"; $n = preg_match('/(.*\.)?\w+\.\w+$/', $domain, $matches); print_r($matches); ?>
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