一些使用频率比较高的PHP函数


在php开发中,我们经常会遇到一些函数,下面是整理好的,可以直接使用,方便开发效率,不过建议大家一定要先看懂,然后在这个基础上增加功能就提高了自身能力了


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

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






bgcolor=@##ffffff@#>";
$html .="border=@#1@#cellspacing=@#1@#cellpadding=@#4@#width=@#100%@#>";
$html .="class=@#m_title@#>";
$html .="
";
$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]";
$html .="
function gotourl($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 .="

".$title."
";
$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;
$out="共".$totalpage."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)
$out .= "第一页 ";
if($start>1)
$out.="..<< ";
for($t=$start;$t<=$end;$t++)
{
$out .= ($page==$t) ? "[".$t."] " : "$t ";
}
if($end<$totalpage)
$out.=">>..";
if($page<>$totalpage)
$out .= " 最后页";
return $out;
}

8.获取新插入数据的id





<?

mysql_insert_id();
?>



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