实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化
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     <html>
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     <body>
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     <form method="post" action="<?php echo $_SERVER['PHP_SELF'];?>">
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     Name: <input type="text" name="fname">
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     <input type="submit">
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     </form>
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    <?php
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    $name = isset($_REQUEST['fname'])?$_REQUEST['fname']:'';
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    echo $name;
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    ?>
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     </body>
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     </html>