PHP文件编辑类

PHP代码

<?php
class EditFile
{
    var $fPoint; //文件指针
    var $fName;  //文件名称
    var $Count;  //文件行数

    //按指定条件打开文件并锁定 |LOCK_SH:读|LOCK_EX:写|LOCK_UN:释放|LOCK_NB|
    function OpenFile($Method="r",$Lock=LOCK_SH)
    {
        if(($Method == 'r' or $Method == 'r+') && !file_exists($this->fName))
        {
            return false;
        }
        else
        {
            $this->fPoint = fopen($this->fName,$Method);
            flock($this->fPoint,$Lock);
            return true;
        }
    }

    //关闭文件
    function CloseFile()
    {
        if(isset($this->fPoint))
        {
            flock($this->fPoint,LOCK_UN);
            fclose($this->fPoint);
            return true;
        }
        else
        {
            return false;
        }
    }

    //读文件到<数组>,文件每行作数组的值,返回一维数组
    function FileToArr()
    {
        if(file_exists($this->fName))
        {
            $rArr = file($this->fName);
            return $rArr;
        }
        else
        {
            return array();
        }
    }

    //读指定长度的文件到<字符串>,没有指定返回全部
    function FileToStr($Size)
    {
        if($this->OpenFile())
        {
            if ($Size < 1)
            {
                $Size = filesize($this->fName);
            }
            $rStr = fread($this->fPoint,$Size);
            rewind($this->fPoint);
            $this->CloseFile();
            return $rStr;
        }
        else
        {
            return "";
        }
    }
    //更改指定行的字符
    function ModifyStr($id,$Data)
    {
        if($this->OpenFile('r+',LOCK_EX))
        {
            $Next = 0; //初始行计数
            while(!feof($this->fPoint))
            {
                $Tell = ftell($this->fPoint); //保存开始读取的位置
                $Temp = fgets($this->fPoint,filesize($this->fName)*1024); //逐行读取
                $Next++;
                if($Next == $id)
                {
                    $Str = fread($this->fPoint,filesize($this->fName)*1024);
                    $Len = strlen($Temp);
                    fseek($this->fPoint,$Tell);  //回绕当行开始处
                    $Write = str_pad($Data,$Len,"\x0E",STR_PAD_LEFT).$Str;
                    fputs($this->fPoint,$Write); //把新串写入文件
                    break;
                }
            }
            $this->CloseFile();
            return true;
        }
        else
        {
            return false;
        }
    }

    //删除指定行的字符
    function DeleteStr($id,$Data)
    {
        if($this->OpenFile('r+',LOCK_EX))
        {
            $Next = 0; //初始行计数
            while(!feof($this->fPoint))
            {
                $Tell = ftell($this->fPoint); //保存开始读取的位置
                $Temp = fgets($this->fPoint,filesize($this->fName)*1024); //逐行读取
                $Next++;
                if($Next == $id)
                {
                    $Len = strlen($Data);
                    fseek($this->fPoint,$Tell);  //回绕当行开始处
                    $Write = str_pad("\x0E",$Len,"\x0E",STR_PAD_LEFT);
                    fputs($this->fPoint,$Write); //把新串写入文件
                    break;
                }
            }
            $this->CloseFile();
            return true;
        }
        else
        {
            return false;
        }
    }

    function GetCount()
    {
        return count($this->FileToArr());
    }

    //写入字符串到文件尾,如果文件不存在则新建
    function WriteToEnd($String)
    {
        if($this->OpenFile("a",LOCK_EX))
        {
            fputs($this->fPoint,$String);
            $this->CloseFile();
            return true;
        }
        else
        {
            return false;
        }
    }

    //覆盖写入字符串,如果文件不存在则新建
    function WriteToNull($String)
    {
        if($this->OpenFile("w",LOCK_EX))
        {
            fputs($this->fPoint,$String);
            $this->CloseFile();
            return true;
        }
        else
        {
            return false;
        }
    }

}

?>