php 多线程上下文中安全写文件实现代码

　　复制代码 代码如下:
<?php
/**
* @usage: used to offer safe file write operation in multiple threads context, arbitory file type
* @author: Rocky Zhang
* @time: Nov. 11 2009
* @demo[0]: $handler = mfopen($file, a+);
* mfwrite($handler, $str);
*/
function mfopen($file, $mode=w+) {
$tempfile = generateTempfile(./tempdir, $file);
preg_match(/b/i, $mode) ($mode .= b); // b is recommended
if (preg_match(/\wa/i, $mode) && !is_writable($file)) {
exit({$file} is not writable!);
}
$filemtime = $filemtime2 = 0;
$tempdir = dirname($tempfile);
is_dir($tempdir) mkdir($tempdir, 0777);
do { // do-while used to avoid modify in a long time copy
clearstatcache();
$filemtime = filemtime($file);
copy($file, $tempfile);
$filemtime2 = filemtime($file);
} while ( ($filemtime2 - $filemtime) != 0 );
if (!$handler = fopen($tempfile, $mode)) {
exit(Fail on opening tempfile, write authentication is must on temporary dir!);
}
return array(0=>$handler, 1=>$filemtime, 2=>$file, 3=>$tempfile, 4=>$mode);
}

// I do think that this function should be optimized further
function mfwrite(&$handler, $str=) {
if (strlen($str) > 0) {
$num = fwrite($handler[0], $str);
fflush($handler[0]);
}
clearstatcache();
$mtime = filemtime($handler[2]);
if ( $mtime == $handler[1] ) { // compare between source file and temporary file
if ( $num && $num > 0 ) { // temporary file has been updated, copy to source file
copy($handler[3], $handler[2]) exit;
$handler[1] = filemtime($handler[3]);
touch($handler[2], $handler[1], $handler[1]);
}
} else { // source file has been modified, load source file to temporary file
copy($handler[2], $handler[3]) exit;
touch($handler[3], $mtime, $mtime);
$handler[1] = $mtime;
}
}

function generateTempfile($tempdir=tempdir, $file) {
$rand = md5(microtime());
return {$tempdir}/{$rand}_.$file;
}
?>