Array file isset Incorrectly Returning False

Question

I have the following PHP code: ``` $haystack = file("dictionary.txt"); $needle = 'john'; $flipped_haystack = array_flip($haystack); if (isset($flipped_haystack[$needle])) { echo "Yes it's there!"; } else { echo "No, it's not there!"; } ``` The contents of `dictionary.txt` are as follows (UTF-8 encoded): ``` john ``` For some reason I keep getting false despite the fact that `$haystack` prints out without any problem. It's just the false that I keep getting which keeps giving me issues. Alternately, I tried changing `$haystack` to the following code which in turn correctly returned as true: ``` $haystack = array("john"); ``` Why is my code wrongly returning false?

Accepted Answer

It's probably because of the line breaks at the end of each element. Try this:

```
$haystack  = file("dictionary.txt", FILE_IGNORE_NEW_LINES);
```

Here is a note from the PHP Manual:

```
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.
```

Array file isset Incorrectly Returning False

Solution

Problem