（转）php读写文件

//例1

if $_POST['submit']=='提交' {
$handle = fopen("list.txt", "w");
fwrite($handle,$_POST['text']);
fclose($handle);
}
?>

function readfromfile($file_name) { //File Reading
if (file_exists($file_name)) {
if (PHP_VERSION >= "4.3.0") return file_get_contents($file_name);
$filenum=fopen($file_name,"r");
$sizeofit=filesize($file_name);
if ($sizeofit<=0) return '';
@flock($filenum,LOCK_EX);
$file_data=fread($filenum, $sizeofit);
fclose($filenum);
return $file_data;
} else return '';
}

function writetofile ($filename, $data) { //File Writing
$filenum=@fopen($filename,"w");
if (!$filenum) {
return false;
}
flock($filenum,LOCK_EX);
$file_data=fwrite($filenum,$data);
fclose($filenum);
return true;
}

?>