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php中header施行后没有输出

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Release: 2016-06-13 11:35:41
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php中header执行后没有输出
$testStr = "aaa";
$testStr = "ccccccccc";
header("HTTP/1.1 304 Not Modified"); 
echo $testStr;
?>
为什么我的的代码会没有输出

php header
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