php使用多个进程同时控制文件读写示例

2015-01-24信息快讯网

这篇文章主要介绍了php使用多个进程同时控制文件读写示例,需要的朋友可以参考下

<?php
/**
 * 写入数据
 * @param  [string] $path [文件路径]
 * @param  [string] $mode [文件打开模式]
 * @param  [string] $data [数据]
 * @return [bool]       
 */
function writeData($path, $mode, $data){
       $fp = fopen($path, $mode);
       $retries = 0;
       $max_retries = 100;
       do {
        if ($retries > 0) {
         usleep(rand(1, 10000));
        }
        $retries += 1;
       }while (!flock($fp, LOCK_EX) and $retries <= $max_retries);
       if ($retries == $max_retries) {
        return false;
       }
       fwrite($fp, $data."\r\n");
       flock($fp, LOCK_UN);
       fclose($fp);
       return true;
}

/** * 读数据 * @param [string] $path [文件路径] * @param [string] $mode [文件打开模式] * @return string */ function readData($path,$mode){ $fp = fopen($path, $mode); $retries = 0; $max_retries = 100; do { if ($retries > 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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