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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<?php
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echo "PHP 很有趣!\n";
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echo "Hello world!\n";
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echo "我计划学习 PHP!\n";
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echo "这段话", "由", "多个", "字符串", "串接而成。";
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?>
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