Question

PHPfor循环遍历一下数组

$students = array(
'2010'=>array('令狐冲',"59"),
'2011'=>array('林平之',"44"),
'2012'=>array('曲洋',"89"),
'2013'=>array('任盈盈',"92"),
'2014'=>array('向问天',"93"),
'2015'=>array('任我行',"87"),
'2016'=>array('冲虚',"58"),
'2017'=>array('方正',"74"),
'2018'=>array('岳不群',"91"),
'2019'=>array('宁中则',"90"),
);
麻烦for循环一下,然后输出一下,只想要for

Answer 1

//只能循环索引数组（下表为0,1,2,3，....）
$arr = array('a','s','d','f','g','h','j','k');

for($i=0;$i<count($arr);$i++){
echo $arr[$i];
}

追问

我想学习一下for循环嵌套for循环,遍历数组嵌套的数组, foreach很好实习,for不会

追答

$arr = array(
    '2010'=>array('令狐冲',"59"),
    '2011'=>array('林平之',"44"),
    '2012'=>array('曲洋',"89"),
    '2013'=>array('任盈盈',"92"),
    '2014'=>array('向问天',"93"),
    '2015'=>array('任我行',"87"),
    '2016'=>array('冲虚',"58"),
    '2017'=>array('方正',"74"),
    '2018'=>array('岳不群',"91"),
    '2019'=>array('宁中则',"90"),
);
$k = Array_keys($arr);//获取数组的键名
$arr2 = Array_values($arr);//获取数组的值

$str = null;
for($i=0;$i<count($arr2);$i++){
    $new_str = null;
     for($n=0;$n<count($arr2[$i]);$n++){
        $new_str.= $arr2[$i][$n];
     }
    $str.= $k[$i].'=='.$new_str."<br>";
}
echo $str;