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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$color = "red";
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echo "Roses are $color";
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echo "<br>";
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echo 'Roses are $color';
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?>
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</body>
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</html>
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