php使用多个进程同时控制文件读写示例_php实例

<?php<BR>/**<BR> * 写入数据<BR> * @param  [string] $path [文件路径]<BR> * @param  [string] $mode [文件打开模式]<BR> * @param  [string] $data [数据]<BR> * @return [bool]       <BR> */<BR>function writeData($path, $mode, $data){<BR>       $fp = fopen($path, $mode);<BR>       $retries = 0;<BR>       $max_retries = 100;<BR>       do {<BR>        if ($retries > 0) {<BR>         usleep(rand(1, 10000));<BR>        }<BR>        $retries += 1;<BR>       }while (!flock($fp, LOCK_EX) and $retries <= $max_retries);<BR>       if ($retries == $max_retries) {<BR>        return false;<BR>       }<BR>       fwrite($fp, $data."\r\n");<BR>       flock($fp, LOCK_UN);<BR>       fclose($fp);<BR>       return true;<BR>}</P><P><BR>/**<BR> * 读数据<BR> * @param  [string] $path [文件路径]<BR> * @param  [string] $mode [文件打开模式]<BR> * @return string      <BR> */<BR>function readData($path,$mode){<BR>     $fp = fopen($path, $mode);<BR>     $retries = 0;<BR>     $max_retries = 100;<BR>     do {<BR>      if ($retri<div>本文来*源gaodai^.ma#com搞#代!码网</div><pre>搞gaodaima代码

es > 0) {
usleep(rand(1, 10000));
}
$retries += 1;
}while (!flock($fp, LOCK_SH) and $retries <= $max_retries);
if ($retries == $max_retries) {
return false;
}
$contents = “”;
while (!feof($fp)) {
$contents .= fread($fp, 8192);
}
flock($fp, LOCK_UN);
fclose($fp);
return $contents;
}

writeData(‘D:/webServer/demo.txt’,’a+’,’this is a demo’);
echo readData(‘D:/webServer’,’r+’);

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