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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$string = "Hello world. Beautiful day today.";
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$token = strtok($string, " ");
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​
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while ($token !== false)
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{
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echo "$token<br>";
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$token = strtok(" ");
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}
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?>
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</body>
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</html>
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​
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​
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​