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PHP常用函数推荐_PHP教程

时间:2021-07-01 10:21:17 帮助过:13人阅读

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);}

#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(...

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