php函数:一些使用频率比较高的PHP函数来源: 发布时间:星期二, 2008年12月30日 浏览:103次 评论:0
在php开发中我们经常会遇到些下面是整理好可以直接使用方便开发效率不过建议大家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.产生随机串 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)]; } $hash; } 2.截取定长度串 注:该对gb2312使用有效 function wordscut($, $length ,$sss=0) { (strlen($) > $length) { ($sss){ $length=$length - 3; $addstr=@# ...@#; } for($i = 0; $i < $length; $i) { (ord($[$i]) > 127) { $wordscut .= $[$i].$[$i + 1]; $i; } { $wordscut .= $[$i]; } } $wordscut.$addstr; } $; } 3.取得客户端ip地址 function getip{ (getenv("http_client_ip") && strcmp(getenv("http_client_ip"), "unknown")) $ip = getenv("http_client_ip"); (getenv("http_x_forwarded_for") && strcmp(getenv("http_x_forwarded_for"), "unknown")) $ip = getenv("http_x_forwarded_for"); (getenv("remote_addr") && strcmp(getenv("remote_addr"), "unknown")) $ip = getenv("remote_addr"); (is($_server[@#remote_addr@#]) && $_server[@#remote_addr@#] && strcmp($_server[@#remote_addr@#], "unknown")) $ip = $_server[@#remote_addr@#]; $ip = "unknown"; ($ip); } 4.创建相应文件夹 function createdir($dir=@#@#) { (!is_dir($dir)) { $temp = explode(@#/@#,$dir); $cur_dir = @#@#; for($i=0;$i<count($temp);$i) { $cur_dir .= $temp[$i].@#/@#; (!is_dir($cur_dir)) { @mkdir($cur_dir,0777); } } } } 5.判断邮箱地址 function checkemail($inaddress) { (ereg("^([a-za-z0-9_-])+@([a-za-z0-9_-])+(\.[a-za-z0-9_-])+",$inaddress)); } 6.跳转 function gotourl($message=@#@#,$url=@#@#,$title=@#@#) { $html ="<html><head>"; (!empty($url)) $html .="<metahttp-equiv=@#refresh@# content=\"3;url=@#".$url."@#\">"; $html .="<linkhref=@#../templates/style.css@# type=text/css rel=stylesheet>"; $html .="</head><body><br><br><br><br>"; $html .="<tablecellspacing=@#0@#cellpadding=@#0@#border=@#1@#width=@#450@#align=@#center@#>"; $html .="<tr><tdbgcolor=@##ffffff@#>"; $html .="<tableborder=@#1@#cellspacing=@#1@#cellpadding=@#4@#width=@#100%@#>"; $html .="<tr=@#m_title@#>"; $html .="<td>".$title."</td></tr>"; $html .="<tr =@#line_1@#><tdalign=@#center@#height=@#60@#>"; $html .="<br>".$message."<br><br>"; (!empty($url)) $html .="系统将在3秒后返回<br>如果您浏览器不能自动返回,请点击[<a href=".$url." target=_self>这里</a>]进入"; $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); ($rs = mysql_fetch_.gif' />($result)) $sums = $rs[0]; $totalpage = ceil($sums/$page_size); ((!$page)||($page<1)) $page=1; $startpos = ($page-1)*$page_size; $sql .=" limit $startpos,$page_size "; $sql; } function showbar($="") { global $page,$totalpage; $out="共<font ".$totalpage."".$totalpage."color=@#red@#><b>".$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; ($page<>1) $out .= "<ahref=@#?page=1&&".$."@#title=第页>第页</a> "; ($start>1) $out.="<ahref=@#?page=".$prestart."@# title=上页>..<<</a> "; for($t=$start;$t<=$end;$t) { $out .= ($page$t) ? "<font [".$t."]color=@#red@#><b>[".$t."]</b></font> " : "<a$t$thref=@#?page=$t&&".$."@#>$t</a> "; } ($end<$totalpage) $out.="<ahref=@#?page=".$nextend."&&".$."@# title=下页>>>..</a>"; ($page<>$totalpage) $out .= " <ahref=@#?page=".$totalpage."&&".$."@# title=最后页>最后页</a>"; $out; } 8.获取新插入数据id <? mysql_insert_id; ?> 本文来自: 脚本的家(www.jb51.net) 详细出处参考:http://www.jb51.net/article/16071.htm TAG: PHP 频率 0
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