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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$replace = array("1: AAA","2: AAA","3: AAA");
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echo implode("<br>",substr_replace($replace,'BBB',3,3));
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?>
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</body>
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</html>
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​
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