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    ▪php 创建短地址 (var_export)的方法      php 创建短地址 (var_export)的方法，有需要的朋友可以参考下。 提交页面 shorten.php：   代码如下: <form method="post" action="/blog_article/show.html">  <input type="text" name="url" value="" />   <input type="subm.........

    ▪php普通表单多文件上传的代码      以下代码中的WEBSITE_DIRROOT代表网站根目录： 代码如下: <?php /* * class: 文件上传类 * author: ZMM * date: 2011.1.20 * email: 304924248@qq.com * link: http://www. */ class Upload { public $up_ext=array(), $up_max=5210,.........

    ▪了解PHP文件上传的原理      以下为大家介绍下PHP文件上传的原理，供初学php的朋友们参考。 先来看一个简单的例子：   代码如下: <form enctyoe="multipart/form-data" method="post" name="upload"> <input name="upfile" name="name"> .........

代码如下:

<form method="post" action="/blog_article/show.html"> 
<input type="text" name="url" value="" />  
<input type="submit" name="submit" value="Shorten Url" /> 
</form> 

代码如下:

<?php 
    include 'functions.php'; 
    include 'shorturls.php'; 
     
    $entry = $_POST['submit']; 
    $url = $_POST['url']; 
    $output = ''; 
     
    if($entry == 'Shorten Url' AND $url) 
    { 
        if(!in_array($url,$shortUrls)) 
        { 
            $uif = alphaID(count($shortUrls),false,6); 
             
            if(!array_key_exists($uif,$shortUrls)) 
            { 
                $shortUrls[$uif] = $url; 
                             
                $file = fopen('shorturls.php','w');  
                fwrite($file,'<?php $shortUrls = ' . var_export($shortUrls,true) . ';?>'); 
                fclose($file); 
                $output = 'Original Url : '.$url.'<br> Shorten Ulr : <a href="http://www.yourdomain.com/api/s='.$uif.'" target="_blank">http://www.yourdomain.com/api/s='.$uif.'</a>'; 
            } 
            else $output = 'access error'; 
        } 
        else 
        { 
            $uif = array_search($url,$shortUrls); 
            $output =  'Original Url : '.$url.'<br> Shorten Ulr : <a href="http://www.yourdomain.com/api/s='.$uif.'" target="_blank">http://www.yourdomain.com/api/s='.$uif.'</a>'; 
        } 
         
        echo $output.'<br><br> <a href="/blog_article/shorten.html">Back</a>'; 
} 
?>

代码如下:

<?php  
    function alphaID($in, $to_num = false, $pad_up = false, $passKey = null) 
    { 
        $index = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; 
        if ($passKey !== null) { 
            // Although this function's purpose is to just make the 
            // ID short - and not so much secure, 
            // with this patch by Simon Franz (http://blog.snaky.org/) 
            // you can optionally supply a password to make it harder 
            // to calculate the corresponding numeric ID 
     
            for ($n = 0; $n<strlen($index); $n++) $i[] = substr( $index,$n ,1); 
     
            $passhash = hash('sha256',$passKey); 
            $passhash = (strlen($passhash) < strlen($index)) 
                ? hash('sha512',$passKey) 
                : $passhash; 
     
            for ($n=0; $n < strlen($index); $n++) $p[] =  substr($passhash, $n ,1); 
     
            array_multisort()($p,  SORT_DESC, $i); 
            $index = implode($i); 
        } 
     
        $base  = strlen($index); 
     
        if ($to_num) { 
            // Digital number  <<--  alphabet letter code 
            $in  = strrev($in); 
            $out = 0; 
            $len = strlen($in) - 1; 
            for ($t = 0; $t <= $len; $t++) { 
                $bcpow = bcpow($base, $len - $t); 
                $out   = $out + strpos($index, substr($in, $t, 1)) * $bcpow; 
            } 
     
            if (is_numeric($pad_up)) { 
                $pad_up--; 
                if ($pad_up > 0) $out -= pow($base, $pad_up); 
            } 
            $out = sprintf()('%F', $out); 
            $out = substr($out, 0, strpos($out, '.')); 
        }  
        else  
        { 
            // Digital number  -->>  alphabet letter code 
            if (is_numeric($pad_up)) { 
                $pad_up--; 
                if ($pad_up > 0) $in += pow($base, $pad_up); 
            } 
     
            $out = ""; 
            for ($t = floor(log($in, $base)); $t >= 0; $t--) { 
                $bcp = bcpow($base, $t); 
                $a   = floor($in / $bcp) % $base; 
                $out = $out . substr($index, $a, 1); 
                $in  = $in - ($a * $bcp); 
            } 
            $out = strrev($out); // reverse 
        } 
     
        return $out; 
    } 
    ?>

代码如下:

<?php $shortUrls = array ();?> 

代码如下:

<?php 
include 'shorturls.php'; 
$uid = $_GET['uid']; 
$addr = ($uid AND array_key_exists($uid,$shortUrls)) ? $shortUrls[$uid]: '/'; 
header('location:'.$addr); 
?>

代码如下:

RewriteEngine On  
RewriteRule ^s=(.*)$ /redirect.php?uid=$1 [R=301,L] 

代码如下:

<?php
/*
* class: 文件上传类
* author: ZMM
* date: 2011.1.20
* email: 304924248@qq.com
* link: http://www.
*/

class Upload {
public $up_ext=array(), $up_max=5210, $up_dir;
private $up_name, $up_rename=true, $up_num=0, $up_files=array(), $up_ret=array();

function __construct($name, $ext=array(), $rename=true) {
if (!empty($name)) {
$this->up_name = $name;
!empty($ext) && $this->up_ext = $ext;
$this->up_rename = $rename;
$this->up_dir = WEBSITE_DIRROOT.
$GLOBALS['cfg_upload_path'];
$this->InitUpload();
} else {
exit('upload文件域名称为空，初始化失败！');
}
}

private function InitUpload() {
if (is_array($_FILES[$this->up_name])) {
$up_arr = count($_FILES[$this->up_name]);
$up_all = count($_FILES[$this->up_name], 1);
$up_cnt = ($up_all - $up_arr) / $up_arr;
for ($i = 0; $i < $up_cnt; $i ++) {
if ($_FILES[$this->up_name]['error'][$i] != 4) {
$this->up_files[] = array(
'tmp_name' => $_FILES[$this->up_name]['tmp_name'][$i],
'name' => $_FILES[$this->up_name]['name'][$i],
'type' => $_FILES[$this->up_name]['type'][$i],
'size' => $_FILES[$this->up_name]['size'][$i],
'error' => $_FILES[$this->up_name]['error'][$i]
);
}
}
$this->up_num = count($this->up_files);
} else {
if (isset()($_FILES[$this->up_name])) {
$this->up_files = array(
'tmp_name' => $_FILES[$this->up_name]['tmp_name'],
'name' => $_FILES[$this->up_name]['name'],
'type' => $_FILES[$this->up_name]['type'],
'size' => $_FILES[$this->up_name]['size'],
'error' => $_FILES[$this->up_name]['error']
);
$this->up_num = 1;
} else {
exit('没找找到需要upload的文件！');
}
}

$this->ChkUpload();
}

private function ChkUpload() {
if (empty($this->up_ext)) {
$up_mime = array('image/wbmp', 'image/bmp', 'image/gif', 'image/pjpeg', 'image/x-png');
foreach ($this->up_files as $up_file) {
$up_allw = false;
foreach ($up_mime as $mime) {
if ($up_file['type'] == $mime) {
$up_allw = true; break;
}
}
!$up_allw && exit('不允许上传'.$up_file['type'].'格式的文件！');

if ($up_file['size'] / 1024 > $this->up_max) {
exit('不允许上传大于 '.$this->up_max.'K 的文件！');
}
}
} else {
foreach ($this->up_files as $up_file) {
$up_ext = end(explode()('.', $up_file['name']));

$up_allw = false;
foreach ($this->up_ext as $ext) {
if ($up_ext == $ext) {
$up_allw = true; break;
}
}
!$up_allw && exit('不允许上传.'.$up_ext.'格式的文件！');

if ($up_file['size'] / 1024 > $this->up_max) {
exit('不允许上传大于 '.$this->up_max.'K 的文件！');
}
}
}

$this->Uploading();
}

private function Uploading() {
if (IO::DIRCreate($this->up_dir)) {
if (chmod($this->up_dir, 0777)) {
if (!empty($this->up_files)) {
foreach ($this->up_files as $up_file) {
if (is_uploaded_file($up_file['tmp_name'])) {
$file_name = $up_file['name'];
if ($this->up_rename) {
$file_ext = end(explode('.', $file_name));
$file_rnd = substr(md5(uniqid()), mt_rand(0, 26), 6);
$file_name = date('ymdHis').'_'.$file_rnd.'.'.$file_ext;
}
$file_name = $this->up_dir.'/'.$file_name;

if (move_uploaded_file($up_file['tmp_name'], $file_name)) {
$this->up_ret[] = str_replace()(WEBSITE_DIRROOT, '', $file_name);
} else {
exit('文件上传失败！');
}
}
}
}
} else {
exit('未开启写入权限！');
}
} else {
exit('上传目录创建失败！');
}
}

public function GetUpload() {
return empty($this->up_ret) ? false : $this->up_ret;
}

function __destruct() {}
}
?>

代码如下:

<form enctyoe="multipart/form-data" method="post" name="upload">
<input name="upfile" name="name">
</form>

<?php
if(is_uploaded_file($_FILES['myFile']['tmp_name'])){
$upfile = $_FILES['upload']；
$name = $upfile['name'];
$type = $upfile['type'];
$size = $upfile['size'];
$tmp_name = $upfile['tmp_name'];
$error = $upfile['error'];
switch($type){
case 'image/pjpeg' : $ok=1;
break
}
if($ok){
move_uploaded_file($tmp_name,'up/'.$name);
}else{
echo "文件类型不允许";
}
}
?>