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1.  $_GET
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http://localhost/a.php?a=ok  
   
  <?  
  echo  
$_GET['a'];   //ÏÔʾ"ok"  
  ?>
2.  $_SERVER['QUERY_STRING']
http://localhost/a.php?a=1&b=2&c=3  
   
  a.php  
  <?  
  echo   $_SERVER['QUERY_STRING'];   //out  
a=1&b=2&c=3  
  ?>
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$_SERVER['DOCUMENT_ROOT']
´úÌæ $DOCUMENT_ROOT
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À´´úÌæ $id
´Ó URL http://www.example.com/test.php?id=3
ÖлñÈ¡ id Öµ£¬Òà»òʹÓà $_ENV['HOME']
À´´úÌæ $HOME
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<html>
<head>
</head>
<body>
<?php
    //echo $_SERVER['QUERY_STRING'];
   
    if(isset($_GET["id"]))
    {
        $b = $_GET["ix"];
        $b +=1;
    }else
    {
        $b = 7;
    }
    echo $b;
?>
<input type="button" value = "aaaaa" onclick = "aaa();">
</body>
<script>
    function aaa(){
        window.location="test.php?id=7&ix=<?php echo $b?>";
    }
</script>
<html>


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