案例：PHP案例     状态：不可编辑再运行    进入竖版
 运行结果　
​x
 
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<?php
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function myTest() {
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   static $x=0;
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   echo $x;
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   $x++;
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}
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​
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myTest();
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echo "\n";
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myTest();
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echo "\n";
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myTest();
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echo "\n";
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myTest();
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echo "\n";
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myTest();
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?>
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​