Weird Error that I am getting with php - php

Question

So I have a PHP program that a line from a text file. Then it uses that line of text it read to point to another text file
$posts = "posts/posts.txt";
$postsLines = file($posts);
$fetchingPost = TRUE;
$postNumber = 0;
$postPointer;
$postPointerString;
$postLines;
$postTag;
$postTitle;
$postContent;
$endCondition = "end";
while ($fetchingPost == TRUE) {
$endOfFile = strcmp($postsLines[$postNumber], $endCondition);
if ($endOfFile == 0) {
$fetchingPost = FALSE;
}
if ($endOfFile <> 0) {
$postPointer[$postNumber] = $postsLines[$postNumber];
$postLines = file($postPointer[$postNumber]);
$postNumber = $postNumber + 1;
}
}
And I get this errors when I run it, I am using the WAMP server
Warning: file(posts/leapMotionSandbox.txt ): failed to open stream: Invalid argument in C:\wamp\www\noahhuppert\Paralax v2\index.php on line 45
Warning: file(posts/topDownShooter.txt ): failed to open stream: Invalid argument in C:\wamp\www\noahhuppert\Paralax v2\index.php on line 45
Please help

Answer 1

The elements of the array returned by file() have a newline at the end of each line. This is not a valid filename character on Windows (it's valid on Unix, although it would be perverse to include newlines in a filename).
From the documentation:
Each line in the resulting array will include the line ending, unless FILE_IGNORE_NEW_LINES is used, so you still need to use rtrim() if you do not want the line ending present.
Your loop can also be simplified greatly. There's no need for the $fetchingPost or $endOfFile variables, just test for the end in the while() condition.
while (($line = rtrim($postsLines[$postNumber]) != $endCondition) {
$postPointer[$postNumber] = $line;
$postLines = file($line);
$postNumber++;
}
Alternatively, you can do:
$postsLines = file($posts, FILE_IGNORE_NEW_LINES);