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求大神讲解

WBOY
Release: 2016-06-23 14:20:04
Original
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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;}


回复讨论(解决方案)

arr=array('中','华','人','民','共','国',);for($flag=true;current($arr);){  echo key($arr), ':', current($arr), ' ', $flag ? 'true':'false', '<br/>';  if($flag){    next($arr);    next($arr);    $flag=false;  }else{    prev($arr);    $flag=true;  }}
Copy after login
0:中 true
2:人 false
1:华 true
3:民 false
2:人 true
4:共 false
3:民 true
5:国 false
4:共 true

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