php 控制多个进程同时读写一个文件
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2022-05-19 21:34:06
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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+');