php中的$_GET如何获取带有井号“#”的参数

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<?php  
echo $_GET['key'];
?>

当url为http://test.com/c.php?key=999时,正常输出:999

当url为http://test.com/c.php?key=9#888时,只能输出:9

而我想要获得的是9#888,那要怎么办呢?只能在把9#888传递给key的这个环节想办法。

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<input placeholder="输入SN码" type="text" id="searchs" name="searchs" />  
<a class='btn' onclick="searchsn();" href="javascript:;">查询</a>
<script>
function searchsn() {
var keys = $('#searchs').val();
if (keys == '') {
alert('请填写SN码');
return false;
}
keys = escape(keys); //对字符串进行编码,* @ - _ + . / 这几个字符除外
window.location.href = 'c.php?key=' + keys;
}
</script>

如果是通过php的header()跳转传递带“#”的参数的话:

a.php

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<?php  
$query = http_build_query(array('key'=>'66#77'));
// var_dump($query); //string 'key=66%2377' (length=11)
header("location:http://test.com/b.php?$query");
?>

b.php

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<?php  
var_dump($_GET['key']); //string '66#77' (length=5)
?>