一些使用频率比较高的php函数
2018-09-07 22:15
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;$i<count($temp);$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=@#@#)
{
$html =<html><head>;
if(!empty($url))
$html .=<meta http-equiv=@#refresh@# content=\3;url=@#.$url.@#\>;
$html .=<link href=@#../templates/style.css@# type=text/css rel=stylesheet>;
$html .=</head><body><br><br><br><br>;
$html .=<table cellspacing=@#0@# cellpadding=@#0@# border=@#1@# width=@#450@# align=@#center@#>;
$html .=<tr><td bgcolor=@##ffffff@#>;
$html .=<table border=@#1@# cellspacing=@#1@# cellpadding=@#4@# width=@#100%@#>;
$html .=<tr class=@#m_title@#>;
$html .=<td>.$title.</td></tr>;
$html .=<tr class=@#line_1@#><td align=@#center@# height=@#60@#>;
$html .=<br>.$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 href=@##@# =@#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;
$out=共or=@#red@#><b>.$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)
$out .= <a href=@#?page=1&&.$string.@#title=第一页>第一页</a> ;
if($start>1)
$out.=<a href=@#?page=.$prestart.@# title=上一页>..<<</a> ;
for($t=$start;$t<=$end;$t++)
{
$out .= ($page==$t) ? <font [.$t.]color=@#red@#><b>[.$t.]</b></font> : <a $thref=@#?page=$t&&.$string.@#>$t</a> ;
}
if($end<$totalpage)
$out.=<a href=@#?page=.$nextend.&&.$string.@# title=下一页>>>..</a>;
if($page<>$totalpage)
$out .= <a href=@#?page=.$totalpage.&&.$string.@# title=最后页>最后页</a>;
return $out;
}
8.获取新插入数据的id
<?
mysql_insert_id();
?>