php in_array-无法验证项目的存在

Question

I'm trying to check whether an item exists in an array that is populated from a file, which consists of filenames, one on each line, like this:
GG.jpg
2J.jpg
WWWW.jpg

I have the following so far:

$UsedAvatars = array();

$UsedAvatars = file('UsedAvatars.txt',  FILE_IGNORE_NEW_LINES );

// This next part is to check that the array has been populated, and
// it works.

for($counter=0; $counter<count($UsedAvatars); $counter++)
{
    echo $counter . "\t" . $UsedAvatars[$counter] . "<br>";
}

echo "<br>";

    // This is hardwired in because I know that it is in the text file
    // used to populate the array and so should return TRUE
    $filename="GG.jpg";

if( in_array( $filename, $UsedAvatars ) )
{
  echo "found";
}

However, the test does not work and "found" is not outputted. I cannot see what is wrong, can anyone help please?

Answer 1

try to replace

if( in_array( $filename, $UsedAvatars ) )
{
  echo "found";
}

to

$tmp = array_flip ($UsedAvatars);
if ($tmp[$filename] != "")
    echo "found";