我用file（）得到的数组值输出中的空格

Question

I tried everything I can find, but I am unable to get the result I'm looking for. I am taking two txt files, combining them together in every possible way with no duplicates and saving the output to a CSV file.

Everything works, except I can't get it to remove the middle space. For example:

list1.txt:

1
2

list2.txt:

dog
cat

The result I get is:

dog 1, dog 2, cat 1, cat 2, 1 dog, 2 dog, 1 cat, 2 cat

But I need (see spaces):

dog1, dog2, cat1, cat2, 1dog, 2dog, 1cat, 2cat

Code:

<?php

    $array1 = file('list1.txt');
    $array2 = file('list2.txt');

    $array3 = array();
    $array4 = array();

    foreach ($array1 as $key1)
    {

        foreach ($array2 as $key2)
        {
            $array3[] = $key1 . $key2;
            {
            $array4[] = $key2 . $key1;
            }
        }

    }

    print_r($array3);
    print_r($array4);


    $fp = fopen('combined.csv', 'w');

    fputcsv($fp, $array3);
    fputcsv($fp, $array4);

    fclose($fp);

?>

Answer 1

Thanks to the help from Rizier123, I solved the problem by simply changing lines 3 and 4 as follows:

$array1 = file('list1.txt', FILE_IGNORE_NEW_LINES);
$array2 = file('list2.txt', FILE_IGNORE_NEW_LINES);

The problem was due to the line breaks in my two list files, as each keyword used in the arrays are on a separate line.