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  Classes of Nicola Covolo   Safe IO   v1/   Download  
File: v1/
Role: Documentation
Content type: text/plain
Description: Documentation
Class: Safe IO
Access files using locks to prevent corruption
Author: By
Last change: Update of v1/
Date: 5 hours ago
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SafeIO ====== A class usefull to avoid concurrancy managing files. ## Introduction SafeIO is an utility to open - write contents in files based on PHP *flock* function. As PHP manual say, multithreading is not supported yet. ## Installation Download *SafeIO.php* and include it in your scripts: ```php require('SafeIO.php'); ``` ## Basic usage Retrive data from a file: ```php $filePath = "data.txt"; SafeIO::open($filePath); ``` Exporting data in a file: ```php $filePath = "data.txt"; $contents = "some cool data"; $reset = true; // true means discard old content inside the file SafeIO::save($filePath, $contents , $reset); ``` ## More for you: transactions Transactions are usefull to ensure an atomic behavior. Expecially, in generic applications , you need to execute actions that require time (like DB queries,loop etc) to know exactly what you need to do: in this situation a common problem is to keep unchanged the target file from modification of others processes. It's easier to see the code ;) Starting a transaction: ```php $filePath = "data.txt"; SafeIO::startTransaction($filePath); ``` Stopping a transaction and writing the file: ```php $filePath = "data.txt"; $contents = "some cool data"; $reset = true; SafeIO::stopTransaction($filePath, $contents, $reset ); ``` Note: * calling function *SafeIO::save* will automatically end and flush the active transaction. * you can keep active multiple transactions(one per file) An example: ```php include("../SafeIO.php"); SafeIO::startTransaction("data.txt","hello world!"); //<---- // ... Other users can't write data.txt while you are inside here ... //<---- SafeIO::stopTransaction("data.txt"); // now the lock is released echo SafeIO::open("data.txt"); ```