1.产生随机字符串函数

function random($length) {

$hash = @#@#;

$chars = @#abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz@#;

$max = strlen($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;

$addstr=@# …@#;

}

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[@#remote_addr@#]) && $_server[@#remote_addr@#] && strcasecmp($_server[@#remote_addr@#], “unknown”))

$ip = $_server[@#remote_addr@#];

else

$ip = “unknown”;

return($ip);

}

4.创建相应的文件夹

function createdir($dir=@#@#)

{

if (!is_dir($dir))

{

$temp = explode(@#/@#,$dir);

$cur_dir = @#@#;

for($i=0;$i            {

$cur_dir .= $temp[$i].@#/@#;

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_-])+@([a-za-z0-9_-])+(\.[a-za-z0-9_-])+”,$inaddress));

}

6.跳转

function gotourl($message=@#@#,$url=@#@#,$title=@#@#)

{

$html  =”“;

if(!empty($url))

$html .=”http-equiv=@#refresh@# content=\”3;url=@#”.$url.”@#\”>”;

$html .=”href=@#../templates/style.css@# type=text/css rel=stylesheet>”;

$html .=”“;

$html .=”cellspacing=@#0@# cellpadding=@#0@# border=@#1@# width=@#450@# align=@#center@#>”;

$html .=”

bgcolor=@##ffffff@#>”;

$html .=”border=@#1@# cellspacing=@#1@# cellpadding=@#4@# width=@#100%@#>”;

$html .=”

class=@#m_title@#>”;

$html .=”“.$title.”“;

$html .=”

class=@#line_1@#>align=@#center@# height=@#60@#>”;

$html .=”

“.$message.”“;

if (!empty($url))

$html .=”系统将在3秒后返回

如果您的浏览器不能自动返回,请点击[这里]进入”;

else

$html .=”[=@#history.go(-1)@#>返回]”;

$html .=”“;

$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;

$out=”共color=@#red@#>“.$totalpage.”>页  “;

$linknum =4;

$start = ($page-round($linknum/2))>0 ? ($page-round($linknum/2)) : “1”;

$end   = ($page+round($linknum/2))    $prestart=$start-1;

$nextend=$end+1;

if($page<>1)

$out .= “href=@#?page=1&&”.$string.”@#title=第一页>第一页 “;

if($start>1)

$out.=”href=@#?page=”.$prestart.”@# title=上一页>..<< “;

for($t=$start;$t<=$end;$t++)

{

$out .= ($page==$t) ? “[“.$t.”] ” : “$t$thref=@#?page=$t&&”.$string.”@#>$t> “;

}

if($end $out.=”href=@#?page=”.$nextend.”&&”.$string.”@# title=下一页>>>..“;

if($page<>$totalpage)

$out .= ” href=@#?page=”.$totalpage.”&&”.$string.”@# title=最后页>最后页“;

return $out;

}

8.获取新插入数据的id

mysql_insert_id();

?>

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原创文章，作者：键盘游走者，如若转载，请注明出处：http://www.708034.com/2008/06/%e8%bf%99%e6%98%af%e4%b8%80%e4%ba%9b%e4%bd%bf%e7%94%a8%e9%a2%91%e7%8e%87%e6%af%94%e8%be%83%e9%ab%98%e7%9a%84php%e5%87%bd%e6%95%b0/