php foreach 二维数组遍历下标问题

代码很简单

<?php
   $myarr=array();
   $myarr[0]=array(0=>"011",1=>"022",2=>"033",);
   $myarr[1]=array(0=>"111",1=>"122",2=>"133",);
   $myarr[2]=array(0=>"211",1=>"222",2=>"233",);
   $myarr[3]=array(0=>"311",1=>"322",2=>"333",);
   $myarr[4]=array(0=>"411",1=>"422",2=>"433",);
   $myarr[5]=array(0=>"511",1=>"522",2=>"533",);

echo"<pre>";
print_r($myarr);
	foreach($myarr as $key)
	{
		print_r($key);
		
	}

?>

 下面是输出的结果

Array
(
    [0] => Array
        (
            [0] => 011
            [1] => 022
            [2] => 033
        )

    [1] => Array
        (
            [0] => 111
            [1] => 122
            [2] => 133
        )

    [2] => Array
        (
            [0] => 211
            [1] => 222
            [2] => 233
        )

    [3] => Array
        (
            [0] => 311
            [1] => 322
            [2] => 333
        )

    [4] => Array
        (
            [0] => 411
            [1] => 422
            [2] => 433
        )

    [5] => Array
        (
            [0] => 511
            [1] => 522
            [2] => 533
        )

)
Array
(
    [0] => 011
    [1] => 022
    [2] => 033
)
Array
(
    [0] => 111
    [1] => 122
    [2] => 133
)
Array
(
    [0] => 211
    [1] => 222
    [2] => 233
)
Array
(
    [0] => 311
    [1] => 322
    [2] => 333
)
Array
(
    [0] => 411
    [1] => 422
    [2] => 433
)
Array
(
    [0] => 511
    [1] => 522
    [2] => 533
)

看到差距了直接输出的有首个下标 ，而foreach只是在第一个数组下进行的遍历 也就是没有首下标

现在比如我们都要用数组表示 511 这个变量myarr的话就是myarr[5][0];而$key只要 $key[1]

就可以了 此时 $key就只有一个数组

Array
(
    [0] => 511
    [1] => 522
    [2] => 533
)

 前面都被覆盖掉了