獲取文件的行數

// 獲取文件行數
function getFileLineCount($fileName)
{
    $fp = fopen($fileName, "r");
    $line = 0;
    while (!feof($fp)) {
        //每次讀取1M
        if ($data = fread($fp, 1024 * 1024 * 1)) {
            //計算讀取到的行數
            $num = substr_count($data, "\n");
            $line += $num;
        }
    }
    fclose($fp);
    return $line;
}