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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$x = 30;
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$y = 65; 
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function addition() {
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   $GLOBALS['z'] = $GLOBALS['x'] + $GLOBALS['y'];
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}
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addition();
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echo $z;
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?>