php使用多个进程同时控制文件读写示例

/**
* 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,$data."rn");
flock($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,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+');