php read and write file - php

Question

function readWrite() {
$fileReader = fopen('file.txt', 'r') or die("ERROR: File not found");
$fileWriter = fopen('filewr.txt', 'w') or die ("ERROR: Write File not
found");
$totalDaysArr= array();
$monthNumArr= array();
$monthArr= array();
$row= file("file.txt");
while($row = fgets($fileReader, 4096)) {
list($monthNumArr[], $monthArr[], $totalDaysArr[]) = explode(",", $row);
}
for($x = 11; $x >= 0; $x--)
{
$table = explode(",", $monthNumArr[$x]);
fwrite($fileWriter, $row[$x]);
}
fclose($fileWriter);
}
I'm a beginner at PHP, so this is what I have so far. My objective is to make a function that will read a file called file.txt and then write it in reverse using arrays. I'm not sure what I am doing wrong here.
These are the requirements:
This function should use PHP array to store records (each line is a "record").
This function should use a PHP Loop to walk through the months names array and generate HTML5/CSS to display the table.
Create a function that writes the text file filewr.txt (reverse order).
This function should use PHP for loop to walk through the array in reverse order and write each array entry (line/record) to the filewr.txt file.
and also the txt file looks like this:
1,January,31
2,February,28
3,March,31
4,April,30
5,May,31
6,June,30
7,July,31
8,August,31
9,September,30
10,October,31
11,November,30
12,December,31

Answer 1

Why use fileReader when you decide to read the data with file("file.txt"); in the end?
The writing process is quite messed up fwrite($fileWriter, $row[$x]) is quite possibly the place where the error comes from: don't you aim to write that table to your file instead of a row from the original input file?
Addition
#Aureliux:
What you want to to is generating a HTML string.
Therefore, lets start with $table='<table>' and put this definition before the loop.
After the loop you add the tables closing tag: $table.='</table>'
The magic happens in between:
For each record you create the corresponding HTML representation.
$table.='<tr><td>'.$monthNumArr.'</td><td>'.$monthArr.'</td><td>'.$totalDaysArr.'</td></tr>'.
Finaly you move the write command after the loop and write the generated Table Markup to your output file.
What you will end up with looks like
function readWrite() {
$fileWriter = fopen('filewr.txt', 'w') or die ("ERROR: Write File not
found");
$totalDaysArr= array();
$monthNumArr= array();
$monthArr= array();
$row= file("file.txt");
while($row = fgets($fileReader, 4096)) {
list($monthNumArr[], $monthArr[], $totalDaysArr[]) = explode(",", $row);
}
$table='<table>';
for($x = 11; $x >= 0; $x--)
{
$table.='<tr><td>'.$monthNumArr.'</td><td>'.$monthArr.'</td><td>'.$totalDaysArr.'</td></tr>';
}
$table.='</table>';
fwrite($fileWriter, $table);
fclose($fileWriter);
}
I have no idea why you would need the reverse loop, but actually, you could achieve the same result with less effort:
function readWrite() {
$row= file("file.txt");
$table='<table>';
for($x = 11; $x >= 0; $x--)
{
$table.='<tr><td>'.implode('</td><td>', explode(',',$row[$x])).'</td></tr>';
}
$table.='</table>';
file_put_contents('file.txt', $table);
}
I did not test it. But the idea should be clear.
Personally, I would agree with #Alive to Die. His approach is the most straight forward.