Output to file doesn't look the way it should - php

Question

So I try to send some output to a file but it doesn't look the way I want.
I have a file with some random integer values , it looks like this:
78, 60, 62, 68, 71, 68, 73, 85, 66, 64, 76, 63, 81, 76, 73, 68, 72, 73, 75, 65, 74, 63, 67, 65, 64, 68, 73, 75, 79, 73
4, 6, 9, 11, 16
9, 10, 16, 18, 20
1, 3, 8, 10, 15
Now what I want to do is for each of these lines print the average, max and min number into another file.
My code for this part is:
while (!feof($aFile))
{
$cnt += 1;
$anArray = array();
$anArray = explode(",", fgets($aFile));
foreach ($anArray as $value)
{
$value = (int)$value;
}
$line = "Line $cnt: Average=" . array_sum($anArray) / count($anArray) . " Max=" . max($anArray) . " Min=" . min($anArray);
fwrite($resultsFile, $line);
fwrite($resultsFile, "\n");
}
The problem is that the resultsFile looks like this:
Line 1: Average=70.6 Max= 85 Min= 60
Line 2: Average=9.2 Max= 16
Min=4
Line 3: Average=14.6 Max= 20
Min=9
Line 4: Average=7.4 Max= 15 Min=1
I couldn't exactly copy paste this , because when I do it pastes it the right way
The problem is that it changes line and then prints Min .
Total Average=50.533333333333 Total Max= 85 Total Min=1

Answer 1

This is kinda tricky and is a combination of several moments.
First - you have new line symbol (\n) in each string of your file.
So, for example string 9, 10, 16, 18, 20 is really a 9, 10, 16, 18, 20\n string.
When you explode this string by ,, last element of your $anArray is not 20, but 20\n (with new line).
Now you're trying to cast each element to int, but as by default php works with copy of array, your initial values in $anArray are unchaged. As correctly stated in comments - to apply changes to original array, use $&value notation:
foreach ($anArray as &$value)
{
$value = (int)$value;
}
And last - all following operations on your $anArray silenlty cast 20\n to int (20). But as noticed in max manual, for example:
The actual value returned will be of the original type with no conversion applied
So, in array ['9', '10', '16', '18', '20\n'] max value will be 20, but returned value will be 20\n which creates a new line and moves Min=... output to next line.