php in_array-無法驗證項目的存在

Question

我正在嘗試檢查從文件填充的數組中是否存在一項，該文件由文件名組成，每行一個，如下所示：
GG.jpg
2J.jpg
WWWW.jpg

到目前為止，我有以下內容：

$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";
}

但是，該測試不起作用，並且不會輸出“找到”。 我看不出有什么問題，有人可以幫忙嗎？

Answer 1

嘗試更換

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

至

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