如何分段阅读此文本文件？

hi I need to read a text file and then explode it to two piece then match it with give name then dispay if it matches...so far the code I made is given below..but it doesnt work..can any one tell me what wrong is with this code??

$name = "thomas";
$filename = file("land.txt");
//$contents = fread($handle, filesize($filename));
for($i=0; $i<count($filename); $i++)
        {
            $string = explode(":", $filename[$i]);

            if($name == $string[1])
                $id = $string[0];
        }

echo $id;

this case it should display "D1"; but it doesnt!!

content of "land.txt" file

D1:thomas
D6:benny
D7:alwyn
D25:mathew
D9:peter

Try

$filename = file("land.txt", FILE_IGNORE_NEW_LINES);

Or

$string = explode(":", trim($filename[$i]));

What is FILE_IGNORE_NEW_LINES

Over here

if($name == $string[1]) use if($name == trim($string[1])) .

Try this and let me know.

  $name = 'thomas';
  $content = file('land.txt');
  $id = NULL;
  foreach($content as $no => $line){
   $array = explode(':', $line);
   if($array[1] == $name)
     $id = $array[0];
  }
  echo $id;