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 $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; $i if(ord($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 { $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='') { $html =""; if(!empty($url)) $html .=" $html .=" "; $html .=" "; $html .=""; $html .=""; $html .=""; $html .=""; $html .="".$title."
"; $html .=""; $html .=" ".$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 .="[]"; $html .="
"; $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 $startpos = ($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)) $prestart=$start-1; $nextend=$end+1; if($page1) $out .= "第一页 "; if($start>1) $out.=".. "; for($t=$start;$t { $out .= ($page==$t) ? "[".$t."] " : " $t "; } if($end $out.=">>.. "; if($page$totalpage) $out .= " 最后页 "; return $out; } ?>
以上就介绍了https://exo-l.smtown.com/home 一些常用的php函数 ,包括了https://exo-l.smtown.com/home方面的内容,希望对PHP教程有兴趣的朋友有所帮助。