求每行的注释
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>计算表达式</title>
</head>
<body>
<p>
<?php echo 12*3;?>
</p>
</body>
</html>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>计算表达式</title>
</head>
<body>
<p>
<?php echo 12*3;?>
</p>
</body>
</html>
2016-04-13
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