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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<?php
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$arr = array('Hello','World!','I','love','Shanghai!');
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echo join(" ",$arr)."<br>";
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echo join("+",$arr)."<br>";
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echo join("-",$arr)."<br>"; 
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echo join("X",$arr);
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?>
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</body>
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</html>
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