Home  >  Article  >  php教程  >  Write files on the hard disk under a certain amount of concurrency

Write files on the hard disk under a certain amount of concurrency

大家讲道理
大家讲道理Original
2016-11-09 10:11:551332browse

<?php
 
function write_log($log_content)
{
    $log_file = &#39;/logs/error.log&#39;;
 
    if(is_file($log_file)) {
        // 检测log文件大小,将每个log文件控制在2m以内
        $log_filesize = filesize($log_file);
        $max_size = 2 * 1024 * 1024; // 可以接受的最大的文件大小
        if($log_filesize >= $max_size) {
            $new_log_file = &#39;/logs/error_&#39; . date(&#39;YmdHis&#39;) . &#39;.log&#39;;
            rename($log_file, $new_log_file);
        }
    }
 
    $fp=fopen($log_file,&#39;a+&#39;);
    if($fp){
        $startTime=microtime();
        do{
            // 这个循环可以保证进程在尝试1m后,如果未能锁定文件,则放弃写入日志的操作
            $canWrite=flock($fp,LOCK_EX);
            if(!$canWrite){
                usleep(round(rand(0,100)*1000));
            }
        }while((!$canWrite)&&((microtime()-$startTime)<1000));
        if($canWrite){
            $content = date(&#39;Y-m-d H:i:s&#39;) . &#39; &#39; . $log_content . "\r\n";
            fwrite($fp,$content);
        }
        fclose($fp);
    }
}

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn