欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  php教程

php 控制多个进程同时读写一个文件

程序员文章站 2022-05-19 21:34:06
...
PHP代码
<?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+');