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XXXI. 文件系统函数库这些函数作为 PHP 核心的一部分，无需被安装即可使用。 这些函数的行为受到全局配置文件 php.ini 的影响。
表格 1. 文件系统和流配置选项 | 名称 | 默认值 | 作用范围 |
|---|
| allow_url_fopen | "1" | PHP_INI_ALL | | user_agent | NULL | PHP_INI_ALL | | default_socket_timeout | "60" | PHP_INI_ALL | | from | NULL | ?? | | auto_detect_line_endings | "Off" | PHP_INI_ALL |
以下是该配置选项的简要解释。
- allow_url_fopen
boolean
本选项激活了 URL 形式的 fopen 封装协议使得可以访问 URL
对象例如文件。默认的封装协议提供用 ftp 和 http 协议来访问远程文件，一些扩展库例如
zlib 可能会注册更多的封装协议。
- user_agent
string
定义 PHP 发送的 User-Agent。
- default_socket_timeout
integer
基于 socket 的流的默认超时时间（秒）。
- from="joe@example.com"
string
定义匿名 ftp 的密码（你的 email 地址）。
- auto_detect_line_endings
boolean
当设为 On 时，PHP 将检查通过
fgets() 和 file()
取得的数据中的行结束符号是符合 Unix，MS-Dos，还是 Macintosh 的习惯。
这使得 PHP 可以和 Macintosh 系统交互操作，但是默认值是 Off，因为在检测第一行的
EOL 习惯时会有很小的性能损失，而且在 Unix
系统下使用回车符号作为项目分隔符的人们会遭遇向下不兼容的行为。
由于这些常量是由该扩展模块定义的，因此只有在该扩展模块被编译到 PHP 中，或者在运行时被动态加载后，这些常量才有效。
ben at nullcreations dot net
14-Nov-2004 11:29
Directed at: fankounter at libero dot it
Erm, I think you missed glob() which does what you're doing, only much more efficiently.
see: http://php.net/glob
fankounter at libero dot it
05-Nov-2004 03:31
// ls(dir,pattern) return file list in "dir" folder matching "pattern"
// ls("path","module.php?") search into "path" folder for module.php3, module.php4, ...
// ls("images/","*.jpg") search into "images" folder for JPG images
function ls($__dir="./",$__pattern="*.*")
{
settype($__dir,"string");
settype($__pattern,"string");
$__ls=array();
$__regexp=preg_quote($__pattern,"/");
$__regexp=preg_replace("/[\\x5C][\x2A]/",".*",$__regexp);
$__regexp=preg_replace("/[\\x5C][\x3F]/",".", $__regexp);
if(is_dir($__dir))
if(($__dir_h=@opendir($__dir))!==FALSE)
{
while(($__file=readdir($__dir_h))!==FALSE)
if(preg_match("/^".$__regexp."$/",$__file))
array_push($__ls,$__file);
closedir($__dir_h);
sort($__ls,SORT_STRING);
}
return $__ls;
}
m2pc (at) hotmail.com
07-Oct-2004 06:18
After searching all over the place to find a function to do what I wanted, I wrote the following:
/*
** Returns an array of valid drives on the system (a:, b:, etc.)
*/
function getSystemDrives () {
// Initialize
$aResult = Array ();
// Loop from A-Z and try opening the root dir
for ($letter = 'A'; $letter <= 'Z'; $letter ++) {
if (is_dir ($letter . ":"))
$aResult [] = $letter . ":";
}
// Return results
return ($aResult);
}
It simply returns an array of valid drives as seen from the server (A:, B:, etc.). This obviously is targeted to Win32 installations only.
Storm Reaver
13-Apr-2004 04:48
The way to write files on server where it is not possible (e.g. Gorodok.net)
<?php
function killfile($ftp, $login, $pass, $filename){
$conn_id = ftp_connect($ftp);
$login_result = ftp_login($conn_id, $login, $pass);
if ((!$conn_id) || (!$login_result)) { return false; } else {
$del = ftp_delete($conn_id, $filename);
if (!del) { return false; } else {return true;}
}
ftp_close($conn_id);
}
killfile("gorodok.net", "login", "password", "/path/file.extension");
$fs = fopen("ftp://login:password@gorodok.net/path/file.extension", "w");
fclose($fs);
?>
ken at xzone9 dot com
16-Mar-2004 09:46
The following will work on UNIX (from peeweeks code submitted for "Windows")---
function ls ($curpath) {
$dir = dir($curpath);
echo("<b>$curpath</b>");
echo "<blockquote>";
while ($file = $dir->read()) {
if($file != "." && $file != "..") {
if (is_dir($curpath.$file)) {
ls($curpath.$file."/");
} else {
echo("$file<br>");
}
}
}
$dir->close();
echo "</blockquote>";
return;
}
//Use:
$startpath = "/home/mypath/";
ls($startpath);
http://iubito.free.fr
30-Dec-2003 01:39
Here is a function I wrote to get the relative path between 2 files or directory.
We suppose that paths are wrotten in Unix format (/ instead of windows \\)
<?php
function relativePath($path1, $path2='')
{
if ($path2 == '') {
$path2 = $path1;
$path1 = getcwd();
}
$path1 = trim($path1,'/');
$path2 = trim($path2,'/');
while (substr_count($path1, '//')) $path1 = str_replace('//', '/', $path1);
while (substr_count($path2, '//')) $path2 = str_replace('//', '/', $path2);
$arr1 = explode('/', $path1);
if ($arr1 == array('')) $arr1 = array();
$arr2 = explode('/', $path2);
if ($arr2 == array('')) $arr2 = array();
$size1 = count($arr1);
$size2 = count($arr2);
$path='';
for($i=0; $i<min($size1,$size2); $i++)
{
if ($arr1[$i] == $arr2[$i]) continue;
else $path = '../'.$path.$arr2[$i].'/';
}
if ($size1 > $size2)
for ($i = $size2; $i < $size1; $i++)
$path = '../'.$path;
else if ($size2 > $size1)
for ($i = $size1; $i < $size2; $i++)
$path .= $arr2[$i].'/';
return $path;
}
?>
Enjoy ! :-)
Gregor Mosheh
23-Aug-2003 02:23
This function searches a directory and returns an array of all files whose filename matches the specified regular expression. It's similar in concept to the Unix find program.
function findfile($location='',$fileregex='') {
if (!$location or !is_dir($location) or !$fileregex) {
return false;
}
$matchedfiles = array();
$all = opendir($location);
while ($file = readdir($all)) {
if (is_dir($location.'/'.$file) and $file <> ".." and $file <> ".") {
$subdir_matches = findfile($location.'/'.$file,$fileregex);
$matchedfiles = array_merge($matchedfiles,$subdir_matches);
unset($file);
}
elseif (!is_dir($location.'/'.$file)) {
if (preg_match($fileregex,$file)) {
array_push($matchedfiles,$location.'/'.$file);
}
}
}
closedir($all);
unset($all);
return $matchedfiles;
}
$htmlfiles = findfile('/some/dir','/\.(htm|html)$/');
Gregor Mosheh
17-Jul-2003 07:25
I needed a function to find disk usage for a directory and its subs, so here it is. It's kinda like the Unix du program, except it returns the usage in bytes, not blocks.
function du($location) {
if (!$location or !is_dir($location)) {
return 0;
}
$total = 0;
$all = opendir($location);
while ($file = readdir($all)) {
if (is_dir($location.'/'.$file) and $file <> ".." and $file <> ".") {
$total += du($location.'/'.$file);
unset($file);
}
elseif (!is_dir($location.'/'.$file)) {
$stats = stat($location.'/'.$file);
$total += $stats['size'];
unset($file);
}
}
closedir($all);
unset($all);
return $total;
}
print du('/some/directory');
aggarwal_deep at hotmail dot com
16-Jul-2003 11:43
The following souce is the combination of 3 different function ,does the listing of the whole files in directories or sub-directories of a base directory(given). And find out the maximum file size of given application files. for example it will tell the maximum file size of ppt file that is placed in the directory.
<?
function showExtension($file){
if(is_file($file)){
$fileInfo = pathinfo($file);
$extension=$fileInfo["extension"];
} else {
$extension="";
}
return $extension;
}
function fsize($size) {
$a = array("B", "KB", "MB", "GB", "TB", "PB");
$pos = 0;
while ($size >= 1024) {
$size /= 1024;
$pos++;
}
return round($size,2)." ".$a[$pos];
}
function ls ($curpath) {
$dir = dir($curpath);
$file_namearr = array("ETC","PPT","XLS","DOC","PDF");
echo("<b>$curpath</b>");
echo "<blockquote>";
$file_sizearr = array(1,1,1,1,1);
while ($file = $dir->read()) {
if($file != "." && $file != "..") {
if (is_dir($curpath.$file)) {
ls($curpath.$file."/");
}
else {
$filext= strtoupper(showExtension($curpath.$file));
$curr_key = 0;
$curr_key = array_search($filext,$file_namearr);
if($curr_key){
$curr_file_size = $file_sizearr[$curr_key];
if(filesize($curpath.$file)>$curr_file_size){
$file_sizearr[$curr_key]= intval(filesize($curpath.$file));
}
}
}
}
}for($k=0;$k<5;$k++){
echo"<br>".$file_namearr[$k].":".fsize($file_sizearr[$k]);
}
$dir->close();
echo "</blockquote>";
return;
}
$startpath = "/home6/docmng/";
ls($startpath);
?>
l_domenech at yahoo dot ca
03-Jul-2003 07:25
In the code samples of the user-contributed notes, you'll find functions that sometimes need a slash at the end of a folder path and sometimes don't.
Here's a little function to append a slash at the end of a path if there isn't one already.
function append_slash_if_none($string)
{
if (ereg ("/$", $string))
{
return $string;
}
else
{
return ereg_replace("$", "/", $string);
}
}
(Replace with a backslash if you're on Windows...)
mitra at mitra dot biz
16-May-2003 07:10
Pollard@php.net contributed this in response to a question on setting these variables ...
This option *IS* settable within your PHP scripts.
Example:
<?php
ini_set('auto_detect_line_endings', true);
$contents = file('unknowntype.txt');
ini_set('auto_detect_line_endings', false);
$content2 = file('unixfile.txt');
?>
Note, with PHP 4.3 anytime Mac files are read using fgets or file you'll need to auto_detect_line_endings since \n is otherwise assumed. However, with PHP 5.0, stream_get_line() will allow you to specify what line ending character to read up to.
\\ Read a line from a MAC file
stream_get_line($fp, 4096, "\r");
\\ Read a line from a UNIX file
stream_get_line($fp, 4096, "\n");
\\ Read a line from a DOS file
stream_get_line($fp, 4096, "\r\n");
\\ Read a line up to any filesystem line ending
ini_set('auto_detect_line_endings', true); fgets($fp);
\\ You can also make up your own line ending characters:
\\ Read up to the first instance of ":"
stream_get_line($fp, 4096, ":");
peeweek at altern dot org
09-May-2003 02:06
here is a function that recurses all directories in a Windows Tree then displays for each directory its contents.
function ls ($curpath) {
$dir = dir($curpath);
echo("<b>$curpath</b>");
echo "<blockquote>";
while ($file = $dir->read()) {
if($file != "." && $file != "..") {
if (is_dir($curpath.$file)) {
ls($curpath.$file."\\");
} else {
echo("$file<br>");
}
}
}
$dir->close();
echo "</blockquote>";
return;
}
Use:
$startpath = "D:\\something\\";
ls($startpath);
regis at webstuff dot com dot br
03-Apr-2003 05:49
Here is a useful function if you're having trouble writing raw bytes into a file.
It receives an integer and returns an array containing the ASCII values of the bytes on each index of the array.
function int2bytes($number){
$byte = $number;
$i=0;
do{
$dec_tmp = $byte;
$byte = bcdiv($byte,256,0);
$resto = $dec_tmp - (256 * $byte);
$return[] = $resto;
} while($byte >= 256);
if($byte) $return[] = $byte;
return array_reverse($return);
}
Example:
$arr = int2bytes(75832);
$arr will contain the following values:
Array
(
[0] => 1
[1] => 40
[2] => 56
)
Now, to write this data to the file, just use a fputs() with chr(), just like this:
fputs($fp,chr($arr[0]).chr($arr[1]).chr($arr[2]))
-- Regis
Alex Chac髇
13-Mar-2003 05:03
alex.chacon@terra.com
Hi
Here there is a function that recursively print all the directories in a Unix system from initial path in pre-order.
$pathInicial = "/home1/desarrollo/";
recorrerDirectorioTree ($pathInicial);
function recorrer DirectorioTree($pathGeneral)
{
echo $pathGeneral . "\n\n";
chdir($pathGeneral);
$dir = dir(".");
$dir-> rewind();
while ($fileName = $dir->read())
{
if ($fileName != "." && $fileName != "..")
{
if (is_dir($fileName) && !is_link($fileName))
{
echo "$fileName \n";
clearstatcache();
recorrerDirectorioTree($pathGeneral.$fileName. "/");
chdir($pathGeneral);
}
}
}
$dir->close();
return;
}
jdhurn at uberidx dot com
08-Mar-2003 04:18
This is a function I use to determine if a file contains Binary information. I use this for my search engine so that it doesn't try to index files like .zip or .mp3 or any other file that doesn't contain readable information. It makes use of the Character Type Extension if it's loaded, if it's not then it uses Regular Expressions.
function is_binary($link)
{
$tmpStr = '';
@$fp = fopen($link, 'rb');
@$tmpStr = fread($fp, 256);
@fclose($fp);
if($tmpStr != '')
{
$tmpStr = str_replace(chr(10), '', $tmpStr);
$tmpStr = str_replace(chr(13), '', $tmpStr);
$tmpInt = 0;
for($i =0; $i < strlen($tmpStr); $i++)
{
if( extension_loaded('ctype') )
{
if( !ctype_print($tmpStr[$i]) )
$tmpInt++;
}
else
{
if( !eregi("[[:print:]]+", $tmpStr[$i]) )
$tmpInt++;
}
}
if($tmpInt > 5)
return(0);
else
return(1);
}
else
return(0);
}
meheler at canada dot com
07-Mar-2002 08:55
Here is a useful function that checks for the existance of a file in PHP's include_path:
// Searches PHP's include_path variable for the existance of a file
// Returns the filename if it's found, otherwise FALSE.
// Only works on a *nix-based filesystem
// Check like: if (($file = file_exists_path('PEAR.php')) !== FALSE)
function file_exists_path($file) {
// Absolute path specified
if (substr($path,0,1)=='/')
return (file_exists($file))?realpath($file):FALSE;
$paths = explode(':',ini_get('include_path'));
foreach ($paths as $path) {
if (substr($path,-1)!='/') $path = "$path/";
if (file_exists("$path$file"))
return realpath("$path$file");
}
return FALSE;
}
Mike
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filepro
