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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$find = array("Hello","world");
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$replace = array("B");
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$arr = array("Hello","world","!");
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print_r(str_replace($find,$replace,$arr));
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?>
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</body>
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</html>
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​
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