多进程读写文件

 1 <?php
 2 //写文件
 3 $f = fopen(‘1.txt‘, ‘a+‘);
 4 flock($f, LOCK_EX);
 5 fwrite($f, ‘hello‘);
 6 flock($f, LOCK_UN);
 7 fclose($f);
 8
 9 //读文件
10 $f = fopen(‘1.txt‘, ‘r+‘);
11 flock($f, LOCK_SH);
12 while(!feof($f)){
13 $c.=fread($f, 8192);
14 }
15
16 flock($f, LOCK_UN);
17 var_dump($c);
18 fclose($f);