php 列出目录与删除目录实例代码

function destroyDir($dir, $virtual = false)
{
$ds = DIRECTORY_SEPARATOR;
$dir = $virtual ? realpath($dir) : $dir;
$dir = substr($dir, -1) == $ds ? substr($dir, 0, -1) : $dir;
if (is_dir($dir) && $handle = opendir($dir))
{
while ($file = readdir($handle))
{
if ($file == '.' || $file == '..')
{
continue;
}
elseif (is_dir($dir.$ds.$file))
{
destroyDir($dir.$ds.$file);
}
else
{
unlink($dir.$ds.$file);
}
}
closedir($handle);
rmdir($dir);
return true;
}
else
{
return false;
}
}

function list_files($dir)
{
if(is_dir($dir))
{
if($handle = opendir($dir))
{
while(($file = readdir($handle)) !== false)
{
if($file != "." && $file != ".." && $file != "Thumbs.db")
{
echo '<a target="_blank" href="'.$dir.$file.'">'.$file.'</a><br>'." ";
}
}
closedir($handle);
}
}
}

/* creates a compressed zip file */
function create_zip($files = array(),$destination = '',$overwrite = false) {
//if the zip file already exists and overwrite is false, return false
if(file_exists($destination) && !$overwrite) { return false; }
//vars
$valid_files = array();
//if files were passed in...
if(is_array($files)) {
//cycle through each file
foreach($files as $file) {
//make sure the file exists
if(file_exists($file)) {
$valid_files[] = $file;
}
}
}
//if we have good files...
if(count($valid_files)) {
//create the archive
$zip = new ZipArchive();
if($zip->open($destination,$overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) {
return false;
}
//add the files
foreach($valid_files as $file) {
$zip->addFile($file,$file);
}
//debug
//echo 'The zip archive contains ',$zip->numFiles,' files with a status of ',$zip->status;

//close the zip -- done!
$zip->close();

//check to make sure the file exists
return file_exists($destination);
}
else
{
return false;
}
}
/***** Example Usage ***/
$files=array('file1.jpg', 'file2.jpg', 'file3.gif');
create_zip($files, 'myzipfile.zip', true);

17. PHP解压缩 Zip 文件

/**********************
*@file - path to zip file
*@destination - destination directory for unzipped files
*/
function unzip_file($file, $destination){
// create object
$zip = new ZipArchive() ;
// open archive
if ($zip->open($file) !== TRUE) {
die ('Could not open archive');
}
// extract contents to destination directory
$zip->extractTo($destination);
// close archive
$zip->close();
echo 'Archive extracted to directory';
}

电子邮件验证也许是中最常用的网页表单验证，此代码除了验证电子邮件地址，也可以选择检查邮件域所属 DNS 中的 MX 记录，使邮件验证功能更加强大。

function is_valid_email($email, $test_mx = false)
{
if(eregi("^([_a-z0-9-]+)(.[_a-z0-9-]+)*@([a-z0-9-]+)(.[a-z0-9-]+)*(.[a-z]{2,4})$", $email))
if($test_mx)
{
list($username, $domain) = split("@", $email);
return getmxrr($domain, $mxrecords);
}
else
return true;
else
return false;
}

function readable_random_string($length = 6){
$conso=array("b","c","d","f","g","h","j","k","l",
"m","n","p","r","s","t","v","w","x","y","z");
$vocal=array("a","e","i","o","u");
$password="";
srand ((double)microtime()*1000000);
$max = $length/2;
for($i=1; $i<=$max; $i++)
{
$password.=$conso[rand(0,19)];
$password.=$vocal[rand(0,4)];
}
return $password;
}

function generate_rand($l){
$c= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
srand((double)microtime()*1000000);
for($i=0; $i<$l; $i++) {
$rand.= $c[rand()%strlen($c)];
}
return $rand;
}

Cannot send session cache limiter

/*

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /home/canna/public_html/sites/default/settings.php教程:130) in /home/canna/public_html/includes/session.inc on line 10

warning: Cannot modify header information - headers already sent by (output started at /home/canna/public_html/sites/default/settings.php:130) in /home/canna/public_html/includes/common.inc on line 99.

any tips教程, ideas or solutions welcome :)
before I dig into the PHP (about which I know little or nothing) :-(

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at E:phpcodeadmin.php:1) in E:phpcodelogolistadminlogo.php on line 2

上网搜了一下，有人说是因为在session_start(); 语句之前有其他的html代码，但是我的session_start(); 已经在做前面了。
还有的说是因为没有设置session 保存路径，需要修改php.ini中的session.save_path = "C:/phpsession" [后边的路径自己设置，并且要保证存在。php.ini 文件一般应位于系统盘/Windows 目录下面]

但是我做如上设置之后还是会有这个提示。后来经过反复测试，终于解决问题。
解决办法：
修改php.ini中的session.auto_start = 0 为 session.auto_start = 1

Warning: Cannot send session cache limiter - headers already sent (output started at /home/alltom/public_html/flame/template.inc.php:1) in /home/alltom/public_html/flame/lib.inc.php on line 550

Whats wrong with that? I mean why am i getting it??

Line 547 to 550 in lib.inc.php:

session_set_save_handler('sess_open', '', 'sess_read', 'sess_write', 'sess_destroy', 'sess_gc');
session_name('s');
session_name('s');
session_start();

Im having problems with session_start() through out the site, any help???

看个实例

<?php
session_start();

echo 'Welcome to page #1';

$_SESSION['favcolor'] = 'green';
$_SESSION['animal']   = 'cat';
$_SESSION['time']     = time();

// Works if session cookie was accepted
echo '<br /><a href="page2.php">page 2</a>';

// Or maybe pass along the session id, if needed
echo '<br /><a href="page2.php?' . SID . '">page 2</a>';
?>

并且<? 前面不能有任何字符
但还有几种我没试，他们是
1.php.ini中的output_buffering=off 改成output_buffering=4096
2.php.ini中的session.save_path是否设置好了
3.pgp.ini中的session.auto_start = 0 改成session.auto_start = 1

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