source: pro-violet-viettel/sourcecode/application/helpers/lockfile_helper.php @ 627

<?php 

if ( ! function_exists('createLockFile'))
{
        function createLockFile ($lockFilePrefix, $maxReach, $timeToUnlock, $lockFilePath = '', $checkLockOnly = FALSE, $colSep = '|')
        {
                $currentTimeStamp = time();
                $filePath = $lockFilePath.$lockFilePrefix.'_lock';
                $fileExisted = file_exists($filePath);
                $content = '';
                $lastTimeLock = '';
                $lockCount = 0;
                $isLocked = 0;
                $ready = 0;
        
                if ($fileExisted) {
                        $content = file_get_contents($filePath);
                }
        
                if ($content != '') {
                        list($lockCount, $lastTimeLock, $isLocked) = explode ($colSep, $content);
                }
        
                $timeDiffMin = $lastTimeLock != '' ? dateDifference(date('Y-m-d H:i:s',$currentTimeStamp), date('Y-m-d H:i:s',$lastTimeLock), '%i') : 0;

                if ($lockCount < $maxReach && $timeDiffMin < $timeToUnlock && !$checkLockOnly) {
                        $lockCount ++;
                        $isLocked = $lockCount < $maxReach ? 0:1;
                        $ready = 1;
                }
                else if ($timeDiffMin > $timeToUnlock) {
                        $lockCount = 1;
                        $isLocked = 0;
                        $ready = 1;
                }
        
                $lockTime = ($isLocked == 1) ? $lastTimeLock : $currentTimeStamp;
                $content = $lockCount . $colSep . $lockTime . $colSep . $isLocked;
                
                if($ready == 1 && !$checkLockOnly) {
                        $fh = fopen ($filePath,'w');
                        fwrite ($fh, $content);
                        fclose ($fh);
                }
        
                return (int)$isLocked;
        }
}

if ( ! function_exists('releaseLockFile'))
{
        function releaseLockFile ($lockFilePrefix, $lockFilePath = '')
        {
                $filePath = $lockFilePath.$lockFilePrefix.'_lock';
                $fileExisted = file_exists($filePath);
                if ($fileExisted) {
                        unlink($filePath);
                }
        }
}

/**
 * dateDifference
 * Return difference between two dates
 *
 * @access      public
 * @param       date    date_1
 * @param       date    date_2
 * @param       string  differenceFormat ()
 * @return      string
 *
 * @example '%y Year %m Month %d Day %h Hours %i Minute %s Seconds', %y Year %m Month %d Day','%m Month %d Day'
 * @example '%d Day %h Hours', '%d Day', '%h Hours %i Minute %s Seconds', '%i Minute %s Seconds','%h Hours', '%a Days'
 */

if ( ! function_exists('dateDifference'))
{
        function dateDifference($date_1 , $date_2 , $differenceFormat = '%a' )
        {
                $datetime1 = date_create($date_1);
                $datetime2 = date_create($date_2);

                $diff = date_diff($datetime1, $datetime2);
                $total = 0;
                switch( $differenceFormat){
                        case "%y":
                                $total = $diff->y + $diff->m / 12 + $diff->d / 365.25; break;
                        case "%m":
                                $total= $diff->y * 12 + $diff->m + $diff->d/30 + $diff->h / 24;
                                break;
                        case "%a":
                                $total = $diff->y * 365.25 + $diff->m * 30 + $diff->d + $diff->h/24 + $diff->i / 60;
                                break;
                        case "%h":
                                $total = ($diff->y * 365.25 + $diff->m * 30 + $diff->d) * 24 + $diff->h + $diff->i/60;
                                break;
                        case "%i":
                                $total = (($diff->y * 365.25 + $diff->m * 30 + $diff->d) * 24 + $diff->h) * 60 + $diff->i + $diff->s/60;
                                break;
                        case "%s":
                                $total = ((($diff->y * 365.25 + $diff->m * 30 + $diff->d) * 24 + $diff->h) * 60 + $diff->i)*60 + $diff->s;
                                break;
                }
                
                return (int)$total;
                /* if( $diff->invert)
                        return -1 * $total;
                else    return $total; */
        }
}