PHP常用函数推荐


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;
}

?>



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