php使用多个进程同时控制文件读写示例

复制代码 代码如下:
/**
 * 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));
        }
        $retries += 1;
       }while (澳门新葡亰网站注册,!flock($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;
}

复制代码 代码如下:

/**
 * 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;
}

/*** 读数据* @param [string] $path [文件路径]* @param
[string] $mode [文件打开模式]* @return string */function readData{
$fp = fopen; $retries = 0; $max_retries = 100; do { if { usleep; }
$retries += 1; }while and $retries <= $max_retries); if ($retries ==
$max_retries) { return false; } $contents = “”; while { $contents .=
fread; } flock; fclose; return $contents;}