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How to write to file in FUSE file system using php
<?php

$op = new FuseOperations();
$op->getattr = "hello_getattr";
$op->open = "hello_open";
$op->read = "hello_read";
$op->readdir = "hello_readdir";
$op->write = "hello_write";

fuse_main( $argv, $op );

function hello_write($path, &$buf, $offset, $fh = None) {
    logit('I am in write function');
    logit($path);
    logit($fh);
}

function hello_getattr( $path, $stbuf ) {
    if( strcmp($path, "/") == 0 ) {
        $stbuf->st_mode = FUSE_S_IFDIR | 0755;
        $stbuf->st_nlink = 2;
    } else {
        $stbuf->st_uid = posix_getuid();
        $stbuf->st_gid = posix_getgid();
        $stbuf->st_mode = FUSE_S_IFREG | 0644;
        $stbuf->st_nlink = 1;
        $stbuf->st_size = 56;
        $stbuf->st_mtime = 1226379246;
    }

    return -FUSE_ENOERR;
}

function hello_open( $path, $fi ) {
    logit('I am in open function');
    if( ($fi->flags & FUSE_O_ACCMODE) != FUSE_O_RDONLY )
    return -FUSE_ENOACCES;

    return -FUSE_ENOERR;
}

function hello_read( $path, &$buf, $size, $offset, $fi ) {
    $data = file_get_contents('/home/poomalai/php_fuse/files'.$path);

    if( $offset > strlen($data) )
    return 0;

    $buf = substr( $data, $offset, $size );

    return strlen($data);
}

function hello_readdir( $path, &$buf ) {
    if( strcmp($path, "/") != 0 )
        return -FUSE_ENOENT;

    $buf[] = ".";
    $buf[] = "..";

    if ($handle = opendir('/home/poomalai/php_fuse/files')) {
        while (false !== ($entry = readdir($handle))) {
            if ($entry != "." && $entry != "..") {
                $buf[] =  $entry;
            }
        }
        closedir($handle);
    }
    return -FUSE_ENOERR;
}


function logit($data) {
    file_put_contents('/home/poomalai/php_fuse/debug.txt', print_r($data, true), FILE_APPEND);
    file_put_contents('/home/poomalai/php_fuse/debug.txt', "n", FILE_APPEND);
}