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求大神讲授

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Release: 2016-06-13 12:39:25
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求大神讲解
在if判断在如何知道$flag何时是ture还是false,或者说怎么知道它是真还是假

   $arr=array('中','华','人','民','共','国',);

   for($flag=ture;current($arr);)){
     echo current($arr),'
';
       if($flag){
           next($arr);
           next($arr);
         $flag=flase;
}else{
 
     prev($arr);
     $flag=ture;}

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