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常用PHP代码 
这是一些使用频率比较高的php函数......
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 $hash; } |
截取一定长度的字符串
注：该函数对GB2312使用有效
| function wordscut($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; } |
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); } |
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); } } } } |
判断邮箱地址
| function checkEmail($inAddress) { return (ereg("^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(\.[a-zA-Z0-9_-])+",$inAddress)); } |
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=@##@# onclick=@#history.go(-1)@#>返回</a>]"; $html .="</td></tr></table></td></tr></table>"; $html .="</body></html>"; echo $html; exit; } |
分页
| function getpage($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; $out="共<font ".$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; 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; } |
获取新插入数据的ID
| <? mysql_insert_id(); ?> |
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