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<?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('/\w|a/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], $str);
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$test = "hello";
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