PHP常用函数推荐

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PHP常用函数推荐 时间：2015/6/28来源：IT猫扑网作者：网管联盟我要评论(0): 这是一些使用频率比较高的函数，有的来自别人的程序......

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;$i<count($temp);$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='')
{

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

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;
$out="共<font color='red'><b>".$totalpage."</b></font>页  ";
    $linkNum =4;
    $start = ($page-round($linkNum/2))>0 ? ($page-round($linkNum/2)) : "1";
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关键词标签：推荐,函数,常用gt

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