Count lines and their occurrences

/**
 * LineStatisticsByFile
 * Creates a list with all lines of the given file and their occurrences.
 *
 * @param     string
 * @param     bool
 * @return    string
 */
function LineStatisticsByFile($Filepath, $IgnoreCase=false, $NewLine="\n"){
 
    if (!file_exists($Filepath)){
        $ErrorMsg  = 'LineStatisticsByFile error: ';
        $ErrorMsg .= 'The given file ' . $Filepath . ' does not exist!';
        die($ErrorMsg);
    }
 
    return LineStatisticsByString(file_get_contents($Filepath), $IgnoreCase, $NewLine);
}
 
/**
 * LineStatisticsByString
 * Creates a list with all lines of the given string and their occurrences.
 *
 * @param     string
 * @param     bool
 * @return    string
 */
function LineStatisticsByString($Lines, $IgnoreCase=false, $NewLine="\n"){
 
    if (is_array($Lines))
        $Lines = implode($NewLine, $Lines);
 
    $Lines = explode($NewLine, $Lines);
 
    $LineArray = array();
 
    // 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,
        // and increase the counters
        if (isset($LineArray[$LineKey]))
            $LineArray[$LineKey] += 1;     
        else                
            $LineArray[$LineKey] = 1;        
    }
 
    // Sort the array
    arsort($LineArray);
 
    // Create a new readable array for the output file
    $NewLineArray = array();    
    while(list($LineKey, $LineValue) = each($LineArray)){        
        $NewLineArray[] = $LineKey . ': ' . $LineValue;    
    }
 
    // Return how many lines were counted
    return implode("\n", $NewLineArray);    
}