Eine Routine zum Entfernen doppelter Zeilen
/**
* RemoveDuplicatedLines
* This function removes all duplicated lines of the given text file.
*
* @param string
* @param bool
* @return string
*/
function RemoveDuplicatedLines($Filepath, $IgnoreCase=false, $NewLine="n"){if (!file_exists($Filepath)){
$ErrorMsg = 'RemoveDuplicatedLines error: ';
$ErrorMsg .= 'The given file ' . $Filepath . ' does not exist!';
die($ErrorMsg);
}$Content = file_get_contents($Filepath);
$Content = RemoveDuplicatedLinesByString($Content, $IgnoreCase, $NewLine);
// Is the file writeable?
if (!is_writeable($Filepath)){
$ErrorMsg = 'RemoveDuplicatedLines error: ';
$ErrorMsg .= 'The given file ' . $Filepath . ' is not writeable!';
die($ErrorMsg);
}// Write the new file
$FileResource = fopen($Filepath, 'w+');
fwrite($FileResource, $Content);
fclose($FileResource);
}/**
* RemoveDuplicatedLinesByString
* This function removes all duplicated lines of the given string.
*
* @param string
* @param bool
* @return string
*/
function RemoveDuplicatedLinesByString($Lines, $IgnoreCase=false, $NewLine="n"){if (is_array($Lines))
$Lines = implode($NewLine, $Lines);$Lines = explode($NewLine, $Lines);
$LineArray = array();
$Duplicates = 0;
// Go trough all lines of the given file
for ($Line=0; $Line < count($Lines); $Line++){// Trim whitespace for the current line
$CurrentLine = trim($Lines[$Line]);// Skip empty lines
if ($CurrentLine == '')
continue;// Use the line contents as array key
$LineKey = $CurrentLine;if ($IgnoreCase)
$LineKey = strtolower($LineKey);// Check if the array key already exists,
// if not add it otherwise increase the counter
if (!isset($LineArray[$LineKey]))
$LineArray[$LineKey] = $CurrentLine;
else
$Duplicates++;
}// Sort the array
asort($LineArray);// Return how many lines got removed
return implode($NewLine, array_values($LineArray));
}[/php]
Quelle: Johnas John