php中常用的函数集合

function getip() {
 if(getenv('http_client_ip') && strcasecmp(getenv('http_client_ip'), 'unknown')) {
  $onlineip = getenv('http_client_ip');
 } elseif(getenv('http_x_forwarded_for') && strcasecmp(getenv('http_x_forwarded_for'), 'unknown')) {
  $onlineip = getenv('http_x_forwarded_for');
 } elseif(getenv('remote_addr') && strcasecmp(getenv('remote_addr'), 'unknown')) {
  $onlineip = getenv('remote_addr');
 } elseif(isset($_server['remote_addr']) && $_server['remote_addr'] && strcasecmp($_server['remote_addr'], 'unknown')) {
  $onlineip = $_server['remote_addr'];
 }
 $onlineip = preg_replace("/^([d.]+).*/", "1", $onlineip);
 return $onlineip;
}

function htmlout($str){
 $guest=$str;
 $guest=str_replace("&","&",$guest);
 $guest=str_replace("  ","　",$guest);
 //$guest=str_replace(" "," ",$guest);
 $guest=str_replace(" ","　",$guest);
 //$guest=htmlspecialchars($guest);
 $guest=str_replace(">",">",$guest);
 $guest=str_replace("<","&lt;",$guest);
 $guest=str_replace("rn","<br>",$guest);
 $guest=str_replace("'","&#039;",$guest);
 $guest=str_replace(""","&quot;",$guest);
 return($guest);
}
function badstr ($str,$to='*') {
 global $global;
 $from = $str;
 $rg_banname=$global['m_badwords'];
 $rg_banname=explode(',',$rg_banname);
 foreach($rg_banname as $value){
  if(strpos($str,$value)!==false){
   //$from = strtr($str,$value,$to);
   $from = str_replace($value,$to,$from);
  }
 }
 return($from);
}
function mkpath($mkpath,$mode=0777){
    $path_arr=explode('/',$mkpath);
    foreach ($path_arr as $value){
        if(!empty($value)){
            if(empty($path))$path=$value;
            else $path.='/'.$value;
            is_dir($path) or mkdir($path,$mode) or chmod($path,$mode);
        }
    }
    if(is_dir($mkpath))return true;
    return false;
}
function daddslashes($string, $force = 0) {
 global $magic_quotes_gpc;
 if(!$globals['magic_quotes_gpc'] || $force || $magic_quotes_gpc) {
  if(is_array($string)) {
   foreach($string as $key => $val) {
    $string[$key] = daddslashes($val, $force);
   }
  } else {
   $string = addslashes($string);
  }
 }
 return $string;
}
function dhtmlspecialchars($string) {
 if(is_array($string)) {
  foreach($string as $key => $val) {
   $string[$key] = dhtmlspecialchars($val);
  }
 } else {
  $string = preg_replace('/&amp;((#(d{3,5}|x[a-fa-f0-9]{4})|[a-za-z][a-z0-9]{2,5});)/', '&1',
  str_replace(array('&', '"', '<', '>'), array('&amp;', '&quot;', '&lt;', '&gt;'), $string));
 }
 return $string;
}
function trimm ($str) {
 $str = trim(str_replace(" ","　",$str));
 //$str = str_replace("'","‘",$str);
 return $str;
}
function cdstr($length) {
 $possible = "0123456789";
 $str = "";
 while(strlen($str) < $length) $str .= substr($possible, (rand() % strlen($possible)), 1);
 return($str);
}
function cdstrletters($length) {
 $possible = "abcdefghijklmnopqrstuvwxyz";
 $str = "";
 while(strlen($str) < $length) $str .= substr($possible, (rand() % strlen($possible)), 1);
 return($str);
}
function cdnumletters($length) {
 $possible = "0123456789abcdefghijklmnopqrstuvwxyz";
 $str = "";
 while(strlen($str) < $length) $str .= substr($possible, (rand() % strlen($possible)), 1);
 return($str);
}

<style type="text/css教程"> 二款php教程分页实例代码
a.pagecool,.pagecoolselect,.pagecoolpre,.pagecoolnext,.pageinfo,.curtotalx,.pagecoolprex,.pagecoolnextx{float:left;height:20px;font-family:arial,宋体;color:#444;font-weight:bold}
a.pagecool,.pagecoolselect{width:22px;height:18px;font-weight:bold;border:#ccc 1px solid;margin:0 3px 0 3px;text-align:center;line-height:18px}
a.pagecool{text-decoration:none;color:#444;background:#fbf9f9;display:block}
a.pagecool:hover,.pagecoolselect{color:#f00;background:#ffc}
.pagecoolpre,.pagecoolnext{margin:0 8px 0 8px}
.pageinfo{line-height:20px;margin:0 0 0 8px;font-family:verdana,arial}
.pageinfo span{color:#f60}
.pagecoolprex,.pagecoolnextx{margin:0 0 0 5px}
.curtotalx{color:#666;line-height:20px;margin:0 2px 0 0;font-weight:normal;font-family:verdana,arial;text-align:right}
</style>
<?php
!function_exists('cdstr') && exit('forbidden');
class wrzc_netpage {
 private $page_name="p";
 private $pagesize=10;//每页显示记录条数
 private $total=0;//总的记录数
 private $pagebarnum=10;//bar数。
 private $totalpage=0;
 private $linkhead="";//url地址头
 private $current_pageno=1;//当前页
 public function __construct($total,$pagesize=10) {  
  if((!is_int($total))||($total<0))die("记录总数错误！");
  if((!is_int($pagesize))||($pagesize<0))die("pagesize错误！");
  $this->set("total",$total);
  $this->set("pagesize",$pagesize);
  $this->set('totalpage',ceil($total/$pagesize));
 }
 public function set($var,$value){
  if(in_array($var,get_object_vars($this)))
     $this->$var=$value;
  else {
    throw new pb_page_exception("error in set():".$var." does not belong to pb_page!");
  }
 }
 public function get_linkhead() {
  $this->set_current_page();
  if(empty($_server['query_string'])){
    $this->linkhead=$_server['request_uri']."?".$this->page_name."=";
  }else{
   if(isset($_get[$this->page_name])){                               
     $this->linkhead=str_replace($this->page_name.'='.$this->current_pageno,$this->page_name.'=',$_server['request_uri']);
   } else {
     $this->linkhead=$_server['request_uri'].'&'.$this->page_name.'=';
   }
  }
 }
 /*为指定的页面返回地址值*/
 public function get_url($pageno=1){
  if(empty($this->linkhead))$this->get_linkhead();
  return str_replace($this->page_name.'=',$this->page_name.'='.$pageno,$this->linkhead);
 }
 /*当前页*/
 public function set_current_page($current_pageno=0) {
  if(empty($current_pageno)){
   if(isset($_get[$this->page_name])){$this->current_pageno=intval($_get[$this->page_name]);}
  }else{
   $this->current_pageno=intval($current_pageno);
  }
  if ($this->current_pageno>$this->totalpage) header("location:./");//$this->current_pageno=1
 }
 public function set_format($str) {return $this->format_left.$str.$this->format_right;}
 /* 获取显示"下一页"*/
 public function next_page() {
  if($this->current_pageno<$this->totalpage){
   return '<a href="'.$this->get_url($this->current_pageno+1).'">'.$this->next_page.'</a>';
  }
  return '';
 }
 /*获取显示“上一页”*/
 public function pre_page() {
  if($this->current_pageno>1){return '<a href="'.$this->get_url($this->current_pageno-1).'">'.$this->pre_page.'</a>';}
  return '';
 }
 /*获取显示“首页”*/
 public function first_page() {return '<a href="'.$this->get_url(1).'">'.$this->first_page."</a>";}
 /*获取显示“尾页”*/
 public function last_page() {return '<a href="'.$this->get_url($this->totalpage).'">'.$this->last_page.'</a>';}
 public function nowbar() {
  if ($this->totalpage > 1){
   $begin=$this->current_pageno-ceil($this->pagebarnum/2);
   $begin=($begin>=1)?$begin:1;
   $return='';
   for($i=$begin;$i<$begin+$this->pagebarnum;$i++){
    if($i<=$this->totalpage){
     if($i!=$this->current_pageno){
      $return.="<a href=".$this->get_url($i)." class=pagecool>".$i.'</a>';
     }else {
      $return.='<div class=pagecoolselect>'.$i.'</div>';
     }
    }else{
     break;
    }
   }
   unset($begin);
  } 
  return $return;
 }
 /*“上一页”*/
 public function pre_bar() {
  if($this->current_pageno>ceil($this->pagebarnum/2)){
    $pageno=$this->current_pageno-$this->pagebarnum;
    if($pageno<=0)$pageno=1;
    return $this->set_format('<a href="'.$this->get_url($pageno).'">'.$this->pre_bar."</a>");
  }
  return $this->set_format('<a href="'.$this->get_url(1).'">'.$this->pre_bar."</a>");
 }
 /*“下一页”*/
 public function next_bar() {
  if($this->current_pageno<$this->totalpage-ceil($this->pagebarnum/2)){
    $pageno=$this->current_pageno+$this->pagebarnum;
    return $this->set_format('<a href="'.$this->get_url($pageno).'">'.$this->next_bar."</a>");
  }
  return $this->set_format('<a href="'.$this->get_url($this->totalpage).'">'.$this->next_bar."</a>");
 }
 /*跳转*/
 public function select() {
  $return='<select name="pb_page_select" onchange="window.location.href=''.$this->linkhead.''+this.options[this.selectedindex].value">';
  for($i=1;$i<=$this->totalpage;$i++){
   if($i==$this->current_pageno){
     $return.='<option value="'.$i.'" selected>'.$i.'</option>';
   }else{
     $return.='<option value="'.$i.'">'.$i.'</option>';
   }
  }
  $return.='</select>';
  return $return;
 }
 public function pagebar($mode=1){
  global $global;
  $this->set_current_page();
  $this->get_linkhead();
  //return ("共有<font color=red><b>".$this->total."</b></font>条记录。");
  switch ($mode) {
   case 1:
    $this->pre_page='<img src='.$global['www_2domain'].'/images/precool.gif title=上一页 class=pagecoolpre>';
    $this->next_page='<img src='.$global['www_2domain'].'/images/nextcool.gif title=下一页 class=pagecoolnext>';
    return $this->pre_page().$this->nowbar().$this->next_page().'<div class=pageinfo>第<span>'.$this->current_pageno.'</span>页 / 共<span>'.$this->totalpage.'</span>页</div>';
   break;
   case 2:
    $this->pre_page='<img src='.$global['www_2domain'].'/images/precoolx.gif title=上一页 class=pagecoolprex>';
    $this->next_page='<img src='.$global['www_2domain'].'/images/nextcool.gif title=下一页 class=pagecoolnextx>';
    return '<div class=curtotalx>'.$this->current_pageno.'/'.$this->totalpage.'</div>'.$this->pre_page().$this->next_page();
    //return '<div class=curtotalx>'.$this->total.'/'.$this->current_pageno.'/'.$this->totalpage.'</div>'.$this->pre_page().$this->next_page();
   break;
   case 3:
    $this->pre_page='<img src='.$global['www_2domain'].'/images/precoolx.gif title=上一页 class=pagecoolprex>';
    $this->next_page='<img src='.$global['www_2domain'].'/images/nextcool.gif title=下一页 class=pagecoolnextx>';
    return '<div class=curtotalx>第'.$this->current_pageno.'页/共'.$this->totalpage.'页</div>'.$this->pre_page().$this->next_page();
   break;
  }
 }
}
?>

代码二

<?php
!function_exists('cdstr') && exit('forbidden');
class uobarpage {
 private $page_name="p";//page标签，用来控制url页。比如说xxx.php?pb_page=2中的pb_page
 private $pagesize=10;//每页显示记录条数
 private $total=0;//总的记录数
 private $pagebarnum=10;//控制记录条的个数。
 private $totalpage=0;//总页数
 private $linkhead="";//url地址头
 private $current_pageno=1;//当前页
 /**
  * 显示符号设置
  */
 private $next_page='>';//下一页
 private $pre_page='<';//上一页
 private $first_page='first';//首页
 private $last_page='last';//尾页
 private $pre_bar='<<';//上一分页条
 private $next_bar='>>';//下一分页条
 private $format_left=' [';
 private $format_right='] ';
 
 public function __construct($total,$pagesize=10) {  
  if((!is_int($total))||($total<0))die("记录总数错误！");
  if((!is_int($pagesize))||($pagesize<0))die("pagesize错误！");
  $this->set("total",$total);
  $this->set("pagesize",$pagesize);
  $this->set('totalpage',ceil($total/$pagesize));
 }
       
 public function set($var,$value)
 {
   if(in_array($var,get_object_vars($this)))
      $this->$var=$value;
   else {
     throw new pb_page_exception("error in set():".$var." does not belong to pb_page!");
   }
 }
 
 /**
  * get the default url获取指定的url地址
  *
  */
/*
 public function get_linkhead() {
  $this->set_current_page();
  $this->linkhead=$_server['php_self']."?".$this->page_name."=";
 }
*/
 public function get_linkhead() {
  $this->set_current_page();
  if(empty($_server['query_string'])){
    $this->linkhead=$_server['request_uri']."?".$this->page_name."=";
  }else{
   if(isset($_get[$this->page_name])){                               
     $this->linkhead=str_replace($this->page_name.'='.$this->current_pageno,$this->page_name.'=',$_server['request_uri']);
   } else {
     $this->linkhead=$_server['request_uri'].'&'.$this->page_name.'=';
   }
  }
 }

 /**
  * 为指定的页面返回地址值
  */
 public function get_url($pageno=1)
 {
   if(empty($this->linkhead))$this->get_linkhead();
   return str_replace($this->page_name.'=',$this->page_name.'='.$pageno,$this->linkhead);
 }
 
 /**
  * 设置当前页面
  *
  */
 public function set_current_page($current_pageno=0) {
  if(empty($current_pageno)){
    if(isset($_get[$this->page_name])){
         $this->current_pageno=intval($_get[$this->page_name]);
    }
  }else{
    $this->current_pageno=intval($current_pageno);
  }
  if ($this->current_pageno>$this->totalpage) header("location:./");//////////$this->current_pageno=1////////////
 }
 
 public function set_format($str) {
   return $this->format_left.$str.$this->format_right;
 }

 /**
  * 获取显示"下一页"的代码
  *
  * @return string
  */
 public function next_page() {
   if($this->current_pageno<$this->totalpage){
     return '　<a href="'.$this->get_url($this->current_pageno+1).'">'.$this->next_page.'</a>　';
   }
   return '';
 }
 
 /**
  * 获取显示“上一页”的代码
  *
  * @return string
  */
 public function pre_page() {
   if($this->current_pageno>1){
     return '<a href="'.$this->get_url($this->current_pageno-1).'">'.$this->pre_page.'</a>　';
   }
   return '';
 }
 
 /**
  * 获取显示“首页”的代码
  *
  * @return string
  */
 public function first_page() {
   return '<a href="'.$this->get_url(1).'">'.$this->first_page."</a>";
 }
 
 /**
  * 获取显示“尾页”的代码
  *
  * @return string
  */
 public function last_page() {
   return '<a href="'.$this->get_url($this->totalpage).'">'.$this->last_page.'</a>';
 }
 
 //gyl1
 public function nowbar() {
   $begin=$this->current_pageno-ceil($this->pagebarnum/2);
   $begin=($begin>=1)?$begin:1;
   $return='';
   for($i=$begin;$i<$begin+$this->pagebarnum;$i++)
   {
     if($i<=$this->totalpage){
       if($i!=$this->current_pageno)
        $return.=' <a href="'.$this->get_url($i).'">'.'<span class=page1 onmouseo教程ver=this.style.background="ffffcc" onmouseout=this.style.background="fbf9f9"><b>'.$i.'</b></span>'.'</a> ';
       else
        $return.='<span class=page2><b>'.$i.'</b></span>';
     }else{
       break;
     }
   }
   unset($begin);
   return $return;
 }
 
 /**
  * 获取显示“上一分页条”的代码
  *
  * @return string
  */
 public function pre_bar()
 {
   if($this->current_pageno>ceil($this->pagebarnum/2)){
     $pageno=$this->current_pageno-$this->pagebarnum;
     if($pageno<=0)$pageno=1;
     return $this->set_format('<a href="'.$this->get_url($pageno).'">'.$this->pre_bar."</a>");
   }
   return $this->set_format('<a href="'.$this->get_url(1).'">'.$this->pre_bar."</a>");
 }
 
 /**
  * 获取显示“下一分页条”的代码
  *
  * @return string
  */
 public function next_bar()
 {
   if($this->current_pageno<$this->totalpage-ceil($this->pagebarnum/2)){
     $pageno=$this->current_pageno+$this->pagebarnum;
     return $this->set_format('<a href="'.$this->get_url($pageno).'">'.$this->next_bar."</a>");
   }
   return $this->set_format('<a href="'.$this->get_url($this->totalpage).'">'.$this->next_bar."</a>");
 }
 
 /**
  * 获取显示跳转按钮的代码
  *
  * @return string
  */
 public function select()
 {
   $return='<select name="pb_page_select" onchange="window.location.href=''.$this->linkhead.''+this.options[this.selectedindex].value">';
   for($i=1;$i<=$this->totalpage;$i++)
   {
     if($i==$this->current_pageno){
       $return.='<option value="'.$i.'" selected>'.$i.'</option>';
     }else{
       $return.='<option value="'.$i.'">'.$i.'</option>';
     }
   }
   $return.='</select>';
   return $return;
 }
 
 /**
  * 获取mysql教程 语句中limit需要的值
  *
  * @return string
  */
 public function limit2(){
   //return ("共有<font color=red><b>".$this->total."</b></font>条记录。");
   //return ('共有<font color=red>'.$this->total.'</font>条记录。第<font color=red>'.$this->current_pageno)."</font>页/共<font color=red>".$this->totalpage.'</font>页';
   return ('<span style="height:20px;padding-top:3px;">共<b>'.$this->current_pageno.' / '.$this->totalpage.'</b>页</span>');
 }
 public function pagebar($mode=1)
 {  global $global;
   $this->set_current_page();
   $this->get_linkhead();
   switch ($mode)
   {
     case '1':
       $this->next_page='<img src='.$global['www_2domain'].'/images/next.gif border=0 align=absmiddle alt=下一页>';
       $this->pre_page='<img src='.$global['www_2domain'].'/images/pre.gif border=0 align=absmiddle alt=上一页>';
       return $this->pre_page().$this->nowbar().$this->next_page();
       //return $this->pre_page().$this->nowbar().$this->next_page().'第'.$this->select().'页';
       break;
   }
   
 }
}
?>

// date_format2($rs['time'],'%y年%m月%d日%h时%m分%s秒');
function date_format2($string, $format='%b %e, %y', $default_date=null)
{
    if (substr(php教程_os,0,3) == 'win') {
           $_win_from = array ('%e',  '%t',       '%d');
           $_win_to   = array ('%#d', '%h:%m:%s', '%m/%d/%y');
           $format = str_replace($_win_from, $_win_to, $format);
    }
    if($string != '') {
        return strftime($format, smarty_make_timestamp($string));
    } elseif (isset($default_date) && $default_date != '') {
        return strftime($format, smarty_make_timestamp($default_date));
    } else {
        return;
    }
}
function smarty_make_timestamp($string){
    if(empty($string)) {
        $string = "now";
    }
    $time = strtotime($string);
    if (is_numeric($time) && $time != -1)
        return $time;
    if (preg_match('/^d{14}$/', $string)) {
        $time = mktime(substr($string,8,2),substr($string,10,2),substr($string,12,2),
               substr($string,4,2),substr($string,6,2),substr($string,0,4));

        return $time;
    }
    $time = (int) $string;
    if ($time > 0)
        return $time;
    else
        return time();
}

header() 函数向客户端发送原始的 http 报头。

认识到一点很重要，即必须在任何实际的输出被发送之前调用 header() 函数（在 php教程 4 以及更高的版本中，您可以使用输出缓存来解决此问题）：

<html>
<?php
// 结果出错
// 在调用 header() 之前已存在输出
header('location: http://www.111cn.net/');
?>语法
header(string,replace,http_response_code)参数 描述
string 必需。规定要发送的报头字符串。
replace 可选。指示该报头是否替换之前的报头，或添加第二个报头。

默认是 true（替换）。false（允许相同类型的多个报头）。
 
http_response_code 可选。把 http 响应代码强制为指定的值。（php 4 以及更高版本可用）

 

<?php
function downfile()
{

 $filename=realpath("resume.html");
 header( "content-type:   application/octet-stream ");
 header( "accept-ranges:   bytes ");
    header( "accept-length: " .filesize($filename));
 header( "content-disposition:   attachment;   filename= 4.html");
 echo file_get_contents($filename);
 readfile($filename);
}
downfile();

?>

 

<?php

function downfile($fileurl)
{
$filename=$fileurl;
$file   =   fopen($filename, "rb");
header( "content-type:   application/octet-stream ");
header( "accept-ranges:   bytes ");
header( "content-disposition:   attachment;   filename= 4.doc");

$contents = "";
while (!feof($file)) {
  $contents .= fread($file, 8192);
}
echo $contents;
fclose($file);

}
$url=$_request['url'];
$url="http://www.111cn.net";
downfile($url);

?>

一个很简单的应用实例，就利用了jquery.ajax来实现无刷新登录效果了，方便很简单扼要，实例也只讲了jquery应用这一圬，php教程那款就没讲了，有需要的朋友可以参考一下。

<script src="js/jquery-1.4.2.js" type="text/网页特效"></script>
<script language="javascript">
function test() {
$.ajax({
type: "post",
url: "ap.asp教程x",
data: "username=123&password=456" ,
success: function(data) {
if (data == "true") {
alert("登陆成功！");
}
else {
alert("登陆失败");
}
}
});
}
function btntestajax_onclick() {
test();
}
</script>

html代码

<form id="form1" runat="server">
<div>
<input id="btntestajax" type="button" value="测试异步刷新" onclick="return btntestajax_onclick()" /></div>
</form>

ap.php文件

<?
 echo true;
?>