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_-])+",$inaddress)); } |
6.跳转
function gotourl($message=@#@#,$url=@#@#,$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(); ?> |
- PHP函数使用入门
- 我PHP的字符串
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