Can be flocked! but the data is lost

[Anon]

Please help!
I am trying to setup a web site that is basicly a all BBS. The script were made to do some complicate works, and I was testing the those scripts to make sure that there is no data loss.
Then I found that if one of the scripts is accessed from two windows, the data in the log file is lost even though flock is working.
I checked that flock() locks the file, and it was working. This problem occor when same script is accessed from two windows and when the the script is reloaded. Dose this kind of data loss happen?

Please help me! I could not figure out this problem.

thanks for reading my english!

[brandonschnell]

its a poorly written script.

post a short example of the code that you're using to read & write files.

[Anon]

This is the test script That I lost data.
This script just dose read and write back same data into same file. Nothing more than that.

At Location 1, the script read one data line where $wid exist stor into $DatalineMove.
At Location 2, the script reinsert same data into randam location (randam $i postion).
At Location 3, the script just reread and rewrite. At this postion, it dose nothing. just read nad write.
I set unset() between each steps becouse I just wanted to make sure.
And all read and write proseses looped for 50 time, wating about micro secounds each steps.

While reloading sometimes, Data will be lost.

set_time_limit (0);
$LIMIT = 50;
$FileName = "./TestLog.log";
$wid = "TestLogLine";


for( $T=0 ; $T < $LIMIT ; $T++ ){
	srand((double)microtime()*1000000);
	$rand = rand( 0 , 10000 );
	usleep( $rand );
	print( "Loop # $T"." Sleep $rand <BR>" );


	//Location 1
	//Get One line from Data file ********************
		$line = file( $FileName );
		for( $i=0 ; $i <  count($line) ; $i++ ){
			$frame = explode("  +  ", $line[$i]);
			$array = explode(":-:", $frame[5]);
			if( trim($array[1]) == $wid ){
				$DatalineMove = $line[$i];
			}
		}
	//Get One line from Data file ********************

	unset($line);
	unset($frame);
	unset($array);


	//Location 2
	//Insert into Randam Location ********************
		$line = file( $FileName );
		srand((double)microtime()*1000000);
		$rand = rand( 0 , count($line) );
		for( $i=0 ; $i <  count($line) ; $i++ ){
			$DataToSave .= $line[$i];
			if( $i == $rand ){
				$DataToSave .= $DatalineMove;
			}
		}

		if( $fp = fopen ( $FileName , "w" ) ){
			if(flock( $fp , LOCK_EX )){
				fputs ($fp , $DataToSave);
				flush( $fp );
				flock( $fp , LOCK_UN );
				fclose ( $fp );
			}
		}
	//Insert into Randam Location ********************


	unset($line);
	unset($rand);
	unset($DatalineMove);
	unset($DataToSave);
	unset($fp);


	//Location 3
	//Just Read & Write Test  ************************
		$line = file( $FileName );
		for( $i=0 ; $i <  count($line) ; $i++ ){
			if($line[$i]){
				$DataToSave .= $line[$i];
			}
		}

		if( $fp = fopen( $FileName , "w" ) ){
			if( flock( $fp , LOCK_EX  ) ){
				fputs ( $fp , $DataToSave );
				flush( $fp );
				flock( $fp , LOCK_UN );
				fclose( $fp );
			}
		}
	//Just Read & Write Test  ************************

	unset($line);
	unset($DataToSave);
	unset($fp);

}

Brandon Schnell wrote:

its a poorly written script.

post a short example of the code that you're using to read & write files.