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php 中current next reset 函数

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Release: 2016-06-13 11:18:27
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$array=array('step one','step two','step three','step four');  //定义一个数组
echo current($array)."
n";       //返回数组第一个元素
next($array);          //数组指针后移一位
next($array);          //数组指针后移一位
echo current($array)."
n";       //返回数组当前元素,第三个值
reset($array);          //指针指向数组第一个值
echo current($array)."
n";       //返回数组第一个值


//

$info=array('red','blue','green');      //定义数组
while($result=current($info))
{
  echo $result;
  echo "
";
  next($info);
}

//

$array=array(
'fruit1'=>'apple',
'fruit2'=>'orange',
'fruit3'=>'grape',
'fruit4'=>'apple',
'fruit5'=>'apple');         //定义数组
while($fruit_name=current($array))      //循环获取数组当前值
{
  if($fruit_name=='apple')        //如果当前值为apple
  {
    echo key($array).'
';       //输出当前值的键名
  }
  next($array);          //数组指针下移一步
}


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