PHP爱好者来看：常用PHP代码

2024-05-04 23:03:31

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这是一些使用频率比较高的函数......

1.产生随机字符串函数

function random($length) {
$hash = @#@#;
$chars = @#[email protected]#;
$max = strlen($chars) - 1;
mt_srand((double)microtime() * 1000000);
for($i = 0; $i < $length; $i++) {
$hash .= $chars[mt_rand(0, $max)];
}
return $hash;
}

2.截取一定长度的字符串

注：该函数对gb2312使用有效

function wordscut($string, $length ,$sss=0) {
if(strlen($string) > $length) {
               if($sss){
                      $length=$length - 3;
                      $[email protected]# [email protected]#;
                }
for($i = 0; $i < $length; $i++) {
   if(ord($string[$i]) > 127) {
    $wordscut .= $string[$i].$string[$i + 1];
    $i++;
   } else {
    $wordscut .= $string[$i];
   }
}
return $wordscut.$addstr;
}
return $string;
}

3.取得客户端ip地址

function getip(){
             if (getenv("http_client_ip") && strcasecmp(getenv("http_client_ip"), "unknown"))
                   $ip = getenv("http_client_ip");
             else if (getenv("http_x_forwarded_for") && strcasecmp(getenv("http_x_forwarded_for"), "unknown"))
                   $ip = getenv("http_x_forwarded_for");
             else if (getenv("remote_addr") && strcasecmp(getenv("remote_addr"), "unknown"))
                   $ip = getenv("remote_addr");
             else if (isset($_server[@#[email protected]#]) && $_server[@#[email protected]#] && strcasecmp($_server[@#[email protected]#], "unknown"))
                   $ip = $_server[@#[email protected]#];
             else
                  $ip = "unknown";
             return($ip);
}

4.创建相应的文件夹

function createdir($[email protected]#@#)
{
        if (!is_dir($dir))
        {
            $temp = explode(@#/@#,$dir);
            $cur_dir = @#@#;
            for($i=0;$i<count($temp);$i++)
            {
                $cur_dir .= $temp[$i][email protected]#/@#;
                if (!is_dir($cur_dir))
                {
                @mkdir($cur_dir,0777);
                }
            }
        }
}

5.判断邮箱地址

function checkemail($inaddress)
{
return (ereg("^([a-za-z0-9_-])[email protected]([a-za-z0-9_-])+(/.[a-za-z0-9_-])+",$inaddress));
}

6.跳转

function gotourl($[email protected]#@#,$[email protected]#@#,$[email protected]#@#)
{
    $html ="<html><head>";
    if(!empty($url))
     $html .="<meta [email protected]#[email protected]# content=/"3;[email protected]#".$url."@#/">";
    $html .="<link [email protected]#../templates/[email protected]# type=text/css rel=stylesheet>";
    $html .="</head><body><br><br><br><br>";
    $html .="<table [email protected]#[email protected]# [email protected]#[email protected]# [email protected]#[email protected]# [email protected]#[email protected]# [email protected]#[email protected]#>";
$html .="<tr><td [email protected]##[email protected]#>";
$html .="<table [email protected]#[email protected]# [email protected]#[email protected]# [email protected]#[email protected]# [email protected]#100%@#>";
$html .="<tr [email protected]#[email protected]#>";
$html .="<td>".$title."</td></tr>";
$html .="<tr [email protected]#[email protected]#><td [email protected]#[email protected]# [email protected]#[email protected]#>";
$html .="<br>".$message."<br><br>";
    if (!empty($url))
     $html .="系统将在3秒后返回<br>如果您的浏览器不能自动返回,请点击[<a href=".$url." target=_self>这里</a>]进入";
    else
     $html .="[<a [email protected]##@# [email protected]#history.go(-1)@#>返回</a>]";
    $html .="</td></tr></table></td></tr></table>";
$html .="</body></html>";
echo $html;
exit;
}

7.分页（两个函数配合使用）

function getpage($sql,$page_size=20)
{
      global $page,$totalpage,$sums; //out param
      $page = $_get["page"];
      //$eachpage = $page_size;
      $pagesql = strstr($sql," from ");
      $pagesql = "select count(*) as ids ".$pagesql;
      $result = mysql_query($pagesql);
      if($rs = mysql_fetch_array($result)) $sums = $rs[0];
      $totalpage = ceil($sums/$page_size);
      if((!$page)||($page<1)) $page=1;
   $startpos = ($page-1)*$page_size;
   $sql .=" limit $startpos,$page_size ";
    return $sql;
}
function showbar($string="")
{
    global $page,$totalpage;
$out="共<font ".$totalpage."[email protected]#[email protected]#><b>".$totalpage."</b></font>页 ";
    $linknum =4;
    $start = ($page-round($linknum/2))>0 ? ($page-round($linknum/2)) : "1";
    $end   = ($page+round($linknum/2))<$totalpage ? ($page+round($linknum/2)) : $totalpage;
    $prestart=$start-1;
    $nextend=$end+1;
    if($page<>1)
$out .= "<a [email protected]#?page=1&&".$string."@#title=第一页>第一页</a> ";
    if($start>1)
$out.="<a [email protected]#?page=".$prestart."@# title=上一页>..<<</a> ";
for($t=$start;$t<=$end;$t++)
    {
     $out .= ($page==$t) ? "<font [".$t."][email protected]#[email protected]#><b>[".$t."]</b></font> " : "<a $t[email protected]#?page=$t&&".$string."@#>$t</a> ";
    }
if($end<$totalpage)
$out.="<a [email protected]#?page=".$nextend."&&".$string."@# title=下一页>>>..</a>";
    if($page<>$totalpage)
   $out .= " <a [email protected]#?page=".$totalpage."&&".$string."@# title=最后页>最后页</a>";
   return $out;
}