欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  后端开发

PHP常用函数推荐_PHP教程

程序员文章站 2022-06-16 22:52:02
...
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 

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  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);}

#p#

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="'){     $html  ="<html><head>";    if(!empty($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;}

7.分页(两个函数配合使用)

 $totalpage = ceil($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; $out="共<font color='red'><b>".$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=>..<<</a> "; for($t=$start;$t<=$end;$t++)    {     $out .= ($page==$t) ? "<font color='red'><b>[".$t."]</b>
</font> " : "<a href='?page=$t&&".$string."'>$t</a> ";    } if($end<$totalpage) $out.="<a href='?page=".$nextend."&&".$string."' title=>>>..</a>";    if($page<>$totalpage)   $out .= " <a href='?page=".$totalpage."&&".$string."' 
title=最后页>最后页</a>";   return $out;}?>


www.bkjia.comtruehttp://www.bkjia.com/PHPjc/446705.htmlTechArticle1.产生随机字符串函数 function random($length) { $hash = ''; $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz'; $max = strlen($chars) - 1; mt_srand(...