案例：php案例     状态：不可编辑再运行    进入竖版
 运行结果　
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<!DOCTYPE html>
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<html>
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<body>
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​
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<?php
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$str = "Who's Bill Gates?";
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echo $str . " This is not safe in a database query.<br>";
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echo addslashes($str) . " This is safe in a database query.";
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?>
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​
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</body>
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</html>
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