如何在多维非关联数组上使用foreach循环 [英] How to use a foreach loop on a multidimensional non associative array

问题描述

我基本上将csv文件employee_data的行读入名为$ data的数组中

I basically read the rows of a csv file employee_data into an array called $data

$dataSrc = "persistence/employee_data.csv";
    $dataFile = fopen($dataSrc, "r") or die("Unable to open file!");
     $i=0;  //index for the array



   while (($data = fgetcsv($dataFile)) !== FALSE) {
  //$data is an array of the csv elements
    print_r($data);
}

    fclose($dataFile);

当我将 $ data 数组中的元素插入到print_r函数中时，它们如下.

The elements within the $data array when I inserted it into the print_r function are as follows.

Array ( [0] => JOHN WILLIAMS [1] => 6/8/1998 [2] => 55456434E [3] => 4321 )
Array ( [0] => SARAH JONES [1] => 15/01/1982 [2] => 56834645Q [3] => 1234 )
Array ( [0] => JAMES Brennan [1] => 09/05/1978 [2] => 25689514W [3] => 8575 ) 

此数组中有3个数组，但是该数组中的每个数组都没有单独的键.

There are 3 arrays in this array but there are no individual keys for each array in the array.

当我尝试遍历数组时，它给了我一个警告.
警告:为foreach()提供了无效的参数"

When I try to iterate through the array, it gives me a warning.
"Warning: Invalid argument supplied for foreach()"

我知道这样的数组

$food = array('Healthy'=>
                        array('Salad', 'Vegetables', 'Pasta'),
               'Unhealthy'=>
                        array('Pizza','Ice cream'));

您将使用类似的方法来访问数组数组中的元素.

You would use something like this to access the elements within the array's of the array.

foreach($food as $element => $inner_array)
{
    echo $element;

    foreach($inner_array as $item)
    {

        echo $item;
    }

}

这种方法不适用于我的 $ data array .您将如何获得对像 $ data 这样的数组的访问权?

This approach doesn't work for my $data array. How would you approach gaining access to an array like $data?

推荐答案

由于 fgetcsv()逐行读取，因此$ data始终包含雇员的最后记录，即单维数组.这里您需要将数据存储到另一个数组(制作多维数组)

Since fgetcsv() read row by row, so $data is always contain last record of employee which is single dimension array. here you need to store data to another array(making multidimensional array)

尝试一下...

$dataSrc = "persistence/employee_data.csv";
$dataFile = fopen($dataSrc, "r") or die("Unable to open file!");
$i=0;  //index for the array
//creating $result array for storing each employee data.
$result = [];

while (($data = fgetcsv($dataFile)) !== FALSE) {
  //assign each employee data to $result array. now result will be multidimensional array.
    $result[] = $data;
}
fclose($dataFile);

您现在可以使用

foreach($result as $resultKey => $employees)
{
    //display key of $result.
    echo $resultKey;

    foreach($employees as $data)
   {     
        echo $data;
    }

}

这篇关于如何在多维非关联数组上使用foreach循环的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！