PHP Multidimensional Array Iterating From Text File - php

Question

I have a text file named C.txt. The contens of the text file goes as following:
Name, BPrice, SPrice, Display
Nokia 520, 20000, 21000, 1
Xiaomi123, 15000, 17000, 0
Xiaomi Redmi, 30000, 32000, 1
I have accessed the file using the following code:
<?php
$file = fopen("C.txt", "r");
while(!feof($file)){
$content = fgets($file);
$products[] = $content;
}
var_dump($products);
?>
var_dump($products) gives output:
array(4) { [0]=> string(33) "Name, BPrice, SPrice, Display " [1]=> string(29) "Nokia 520, 20000, 21000, 1 " [2]=> string(29) "Xiaomi123, 15000, 17000, 0 " [3]=> string(30) "Xiaomi Redmi, 30000, 32000, 1 " }
What I wanted to do, is to separate the Name, BPrice, SPrice and Display columns and their values using explode() method. So, I tried the following:
<?php
for($i=1; $i<count($products); $i++){
$contents[] = explode(",", $products[$i]);
}
var_dump($contents);
?>
var_dump($contents) yields:
array(3) { [0]=> array(4) { [0]=> string(9) "Nokia 520" [1]=> string(6) " 20000" [2]=> string(6) " 21000" [3]=> string(5) " 1 " } [1]=> array(4) { [0]=> string(9) "Xiaomi123" [1]=> string(6) " 15000" [2]=> string(6) " 17000" [3]=> string(5) " 0 " } [2]=> array(4) { [0]=> string(12) "Xiaomi Redmi" [1]=> string(6) " 30000" [2]=> string(6) " 32000" [3]=> string(3) " 1 " } }
NOTE: I wanted to access only the values of the columns and not the headers, hence for($i=1; $i<count($products); $i++)
Now here is where I'm facing the problem. How do I access this two dimensional array $contents?
I have tried the foreach loop as following:
foreach ($contents as $key => $value) {
echo $value[$key];
}
But that results in:
Nokia 520 15000 32000
I cannot seem to figure out why it is not printing the rest of the two rows! Any help would be greatly appreciated. Thanks in advance! :)

Answer 1

Your problem is in the echo $value[$key];.
The $key variable in this context holds the key of current $contents array member, while you are using it to access the value of the inside array, the product data.
Since this is a multi-dimensional array, you will need multiple loops to print it all out. So if you'd like to do that, it would work like this:
foreach ($contents as $productValues) {
foreach ($productValues as $productValue) {
echo $productValue;
}
echo PHP_EOL;
}

Answer 2

Try this function for parsing cvs files into an associative array with the column names as array keys:
function csvArray($file) {
$csv = array_map('str_getcsv', file($file));
array_walk($csv, function(&$a) use ($csv) {
$a = array_combine($csv[0], $a);
});
array_shift($csv);
return $csv;
}
Then result of
$phones = csvArray('c.txt');
print_r($phones);
Is:
Array
(
[0] => Array
(
[Name] => Nokia 520
[ BPrice] => 20000
[ SPrice] => 21000
[ Display] => 1
)
[1] => Array
(
[Name] => Xiaomi123
[ BPrice] => 15000
[ SPrice] => 17000
[ Display] => 0
)
[2] => Array
(
[Name] => Xiaomi Redmi
[ BPrice] => 30000
[ SPrice] => 32000
[ Display] => 1
)
)

Answer 3

Your array in more readable terms looks like this
[["Nokia 520", "20000", "21000", "1"],
["Xiaomi123", "15000", "17000", "0"],
["Xiaomi Redmi", "30000", "32000", "1"]]
This means that in your foreach, the value of your first key is
["Nokia 520", "20000", "21000", "1"]
The reason you are only getting those values is that you are doing
echo $value[$key];
So essentially you are returning positions 0 1 and 2 of ["Nokia 520", "20000", "21000", "1"], which are the values Nokia 520, 20000 and 21000
To get the values you actually want, you need to perform two foreach loops
foreach ($arr as $keys) {
foreach($keys as $value) {
echo "{$value} ";
}
echo "\n";
}