php 防止脚本重复执行

<?php /** * 腳本鎖 * * 主要用于防止 crontab 腳本重復執行 * @author eason * @date 2011-11-22 */ class ScriptLock { private $configs; static private $orderno;//用于區分腳本 function __construct() { $this->orderno = time(); $this->configs = require(dirname(__FILE__) . '/Config/ScriptLock.inc.php'); } /* * 設置pid文件生成路徑 -- 一般不會用到 */ public function setDir($dir){ $this->configs['lock_file'] = $dir; } /* * Script lock file 創建及檢查 */ public function create($file) { $file_name = md5($file); $lock_dir = $this->configs['lock_file']; $lock_file = $lock_dir.'/'.$file_name.'.pid'; if(!file_exists($lock_file) ){ if(!$this->mkdirs($lock_dir)){ die("Failed to create file directory! ".$lock_dir); } $fp = fopen($lock_file, 'w') or die('Lock file can not write! '.$lock_file); @fwrite($fp,'ok'); @fclose($fp); $this->write_log($file. "\t\tscript run begin"); }else{ $this->write_log($file. "\t\tscript had runed"); die("Script had runed! "); } } /* * Script lock file 刪除 */ public function delete($file){ $file_name = md5($file); $lock_dir = $this->configs['lock_file']; $lock_file = $lock_dir.'/'.$file_name.'.pid'; if(file_exists($lock_file) ){ if (!unlink($lock_file)){ die("Lock file delete error! ".$lock_file); }else{ $this->write_log($file. "\t\tscript run end"); die("Lock file had deleted! "); } } } /** * 創建一個/多個目錄 */ public function mkdirs($dir){ if(!is_dir($dir)){ if(!$this->mkdirs(dirname($dir))){ return false; } if(!mkdir($dir,0777)){ return false; } } return true; } function write_log($msg) { $lock_dir = $this->configs['lock_file']; $log_dir = $lock_dir."/log"; if(!$this->mkdirs($log_dir)){ die("Failed to create file directory! ".$log_dir); } $log_file = $log_dir."/".date('Ymd').".txt"; $fp = fopen($log_file, 'a'); @fwrite($fp, date('Y-m-d H:i:s', time()) . "\t" . $this->orderno . "\t" . $msg . "\r\n"); @fclose($fp); } } ?>