PHP enables multiple processes to write to a file at the same time

This article mainly introduces the realization of multiple processes writing a file at the same time in PHP. It has a certain reference value. Now I share it with you. Friends in need can refer to it

<?php
function writefile( $filename, $data ){
 $fp = fopen( $filepath, &#39;a&#39;);    / /以追加的方式打开文件，返回的是指针
 do{
  usleep(100 ); //暂停执行程序，参数是以微秒为单位的
 }while( !flock( $fp, LOCK_EX ) );//以独享写入的方式锁定文件，成功则返回TRUE，否则FALSE
}
 $res = fwrite( $fp, $data."/n");// 以追加的方式写入数据到打开的文件
 flock( $fp, LOCK_UN );//解锁，以让别的进程进行锁定
 fcloce( $fp );//关闭打开的文件指针
 return $res;//返回写入结果
?>

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