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常用function

时间：2010-01-08

来源：互联网

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++) { //OsPHP.COM.CN
 $hash .= $chars[mt_rand(0, $max)];
}
return $hash;
}

?>
-----------------------------------------------------------------------------------------------------------------------

截取一定长度的字符串（该函数对GB2312使用有效）
<?
function Wordscut($string, $length ,$sss=0) { strlen($string) > $length) {
 if($sss){
 $length=$length - 3;
 $addstr=@# ...@#;

if(
 }
 for($i = 0; $i < $length; $i++) {
 if(ord($string[$i]) > 127) {
 $wordscut .= $string[$i].$string[$i + 1]; //OSPHP.com.CN
 $i++;
 } else {
 $wordscut .= $string[$i];
 }
 }
 return $wordscut.$addstr;
}
return $string;
}

?>
-----------------------------------------------------------------------------------------------------------------------
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"); 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);
}

?>
判断邮箱地址
<?
function checkEmail($inAddress)
{
return (ereg("^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+",$inAddress));
}

?>

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;
$out="共".$totalpage."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=上一页>..<<</a> ";

for($t=$start;$t<=$end;$t++)
 {
 $out .= ($page==$t) ? "[".$t."] " : "<a $thref=@#?page=$t&&".$string."@#>$t</a> "; $end<$totalpage)
$out.="<a href=@#?page=".$nextend."&&".$string."@# title=下一页>>>..</a>";
 if($page<>$totalpage)
 $out .= " <a href=@#?page=".$totalpage."&&".$string."@# title=最后页>最后页</a>"; //开源代码OSPhP.COm.CN
 return $out;
}

?>

//获得当前的脚本网址
<?
function get_php_url(){
 if(!empty($_server["REQUEST_URI"])){ //oSPHP.COM.CN
 $scriptName = $_SERVER["REQUEST_URI"];
 $nowurl = $scriptName;
 }else{
 $scriptName = $_SERVER["PHP_SELF"]; $_SERVER["QUERY_STRING"])) $nowurl = $scriptName;
 else $nowurl = $scriptName."?".$_SERVER["QUERY_STRING"];
 } $nowurl;
}

?>

//把全角数字转为半角数字
<?
function GetAlabNum($fnum){
 $nums = array("０","１","２","３","４","５","６","７","８","９"); $fnums = "0123456789";
 for($i=0;$i<=9;$i++) $fnum = str_replace($nums[$i],$fnums[$i],$fnum);
 $fnum = ereg_replace("[^0-9.]|^0{1,}","",$fnum);
 if($fnum=="") $fnum=0;
 return $fnum;
}

?>



//去除HTML标记
<?
function Text2Html($txt){
 $txt = str_replace(" ","　",$txt);
 $txt = str_replace("<","<",$txt);
 $txt = str_replace(">",">",$txt);
 $txt = preg_replace("/[rn]{1,}/isU","
rn",$txt);
 return $txt;
}

?>

//相对路径转化成绝对路径
<?
function relative_to_absolute($content, $feed_url) {
 preg_match('/(http|https|ftp):///', $feed_url, $protocol);
 $server_url = preg_replace("/(http|https|ftp|news):///", "", $feed_url); //OSPHP.com.CN
 $server_url = preg_replace("//.*/", "", $server_url);

 if ($server_url == '') {
 return $content;
 }

 if (isset($protocol[0])) {
 $new_content = preg_replace('/href="//', 'href="'.$protocol[0].$server_url.'/', $content);
 $new_content = preg_replace('/src="//', 'src="'.$protocol[0].$server_url.'/', $new_content); $new_content = $content;
 }
 return $new_content;
}

?>

//取得所有链接
<?
function get_all_url($code){
 preg_match_all('/<as+href=["|']?([^>"' ]+)["|']?s*[^>]*>([^>]+)</a>/i',$code,$arr);
 return array('name'=>$arr[2],'url'=>$arr[1]);
}

?>

//HTML表格的每行转为CSV格式数组 <?
function get_tr_array($table) { //PHP开源代码
 $table = preg_replace("'<td[^>]*?>'si",'"',$table);
 $table = str_replace("</td>",'",',$table);
 $table = str_replace("</tr>","{tr}",$table); //去掉 HTML 标记
 $table = preg_replace("'<[/!]*?[^<>]*?>'si","",$table);
 //去掉空白字符
 $table = preg_replace("'([rn])[s]+'","",$table);


 $table = str_replace(" ","",$table);
 $table = str_replace(" ","",$table);

 $table = explode(",{tr}",$table); array_pop($table);
 return $table;
}

?>



//将HTML表格的每行每列转为数组，采集表格数据
<?
function get_td_array($table) {
 $table = preg_replace("'<table[^>]*?>'si","",$table); $table = preg_replace("'<tr[^>]*?>'si","",$table);
 $table = preg_replace("'<td[^>]*?>'si","",$table);
 $table = str_replace("</tr>","{tr}",$table); $table = str_replace("</td>","{td}",$table);
 //去掉 HTML 标记
 $table = preg_replace("'<[/!]*?[^<>]*?>'si","",$table);
 //去掉空白字符
 $table = preg_replace("'([rn])[s]+'","",$table);
 $table = str_replace(" ","",$table);
 $table = str_replace(" ","",$table);

 $table = explode('{tr}', $table);
 array_pop($table);
 foreach ($table as $key=>$tr) {
 $td = explode('{td}', $tr);
 array_pop($td);
 $td_array[] = $td; $td_array;
}

?>

作者: duqingnian 发布时间: 2010-01-08