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PHP经典函数收藏

[ 2010/08/29 11:31 | by selboo ]


php生成excel文档

<?
header("Content-type:application/vnd.ms-excel");
header("Content-Disposition:filename=test.xls");
echo "test1t";
echo "test2tn";
echo "test1t";
echo "test2tn";
echo "test1t";
echo "test2tn";
echo "test1t";
echo "test2tn";
echo "test1t";
echo "test2tn";
echo "test1t";
echo "test2tn";
//改动相应文件头就可以输出.doc .xls等文件格式了

?>


时间比较问题
举一个简单例子说明:比如一个论坛对当天发表的贴子用new图片标记一下。
方法一：

<?
//$db->rows[$i][date]中为数据库中datetime字段值.
$today=time();
$theDay=date("Y-m-d H:i:s",$today-24*3600);
$newTag=$db->rows[$i][date]>=$theDay?"<img src='../image/newinfor.gif'>":"";
//方法二：
$newTag=$db->rows[$i][date]>=date("Y-m-d 00:00:00")?"<img src='../image/newinfor.gif'>":"";

?>


//提取页面和浏览器提交的变量，作用相当于使PHP.INI开了全局变量

<?
@extract($_SERVER, EXTR_SKIP);
@extract($_SESSION, EXTR_SKIP);
@extract($_POST, EXTR_SKIP);
@extract($_FILES, EXTR_SKIP);
@extract($_GET, EXTR_SKIP);
@extract($_ENV, EXTR_SKIP);
?>


//读取文件函数

<?
function readfromfile($file_name) {
if (file_exists($file_name)) {
$filenum=fopen($file_name,"r");
flock($filenum,LOCK_EX);
$file_data=fread($filenum, filesize($file_name));
rewind($filenum);
fclose($filenum);
return $file_data;
}
}

?>


//写入文件函数

<?
function writetofile($file_name,$data,$method="w") {
$filenum=fopen($file_name,$method);
flock($filenum,LOCK_EX);
$file_data=fwrite($filenum,$data);
fclose($filenum);
return $file_data;
}

?>


//页面快速转向


<?
function turntopage($url="index.php",$info = "页面转向中...",$second=2){
print "<html>n<head>n<title>页面转向中....</title>n";
print "<meta http-equiv="refresh" content="$second;url=$url">n";
print "<style type="text/css">n<!--n";
print "td { font-family: "Verdana", "Arial";font-size: 12px}n";
print "A {COLOR: #000000; TEXT-DECORATION: none}n";
print "-->n</style>n";
print "</head>n<body>n";
print "<table width="100%" border="0" align="center">n";
print " <tr>n";
print " <td height="200"> </td>n";
print " </tr>n";
print " <tr>n";
print " <td align="center">n";
print " <table width="60%" border="0" cellpadding="8" bgcolor="#AA9FFF">n";
print " <tr>n";
print " <td height="30" align="center">页面转向提示信息</td>n";
print " </tr>n";
print " <tr>n";
print " <td align="center">$info</td>n";
print " </tr>n";
print " <tr>n";
print " <td align="center">n";
print " <a href="$url">如果你的浏览器不支持自动跳转,请按这里</a></td>n";
print " </tr>n";
print " </tr>n";
print " </table></td>n";
print " </tr>n";
print " <tr>n";
print " <td height="200"> </td>n";
print " </tr>n";
print "</table>n";
print "</body>n</html>";
exit;
?>


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;
}

?>


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) {
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;
}

?>


取得客户端IP地址 //zuolo 由于防火墙的原因 REMOTE_ADDR 就是服务器外网IP

<?
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);
}

?>



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

for($t=$start;$t<=$end;$t++)
    {
     $out .= ($page==$t) ? "<font [".$t."]color=@#red@#><b>[".$t."]</b></font> " : "<a $thref=@#?page=$t&&".$string."@#>$t</a> ";
    }
if($end<$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>";
   return $out;
}

?>


获取新插入数据的ID

<?
mysql_insert_id();
?>


//获得当前的脚本网址

<?
function get_php_url(){
        if(!empty($_server["REQUEST_URI"])){
                $scriptName = $_SERVER["REQUEST_URI"];
                $nowurl = $scriptName;
        }else{
                $scriptName = $_SERVER["PHP_SELF"];
                if(empty($_SERVER["QUERY_STRING"])) $nowurl = $scriptName;
                else $nowurl = $scriptName."?".$_SERVER["QUERY_STRING"];
        }
        return $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);
        $fnum = ereg_replace("[^0-9.]&#124;^0{1,}","",$fnum);
        if($fnum=="") $fnum=0;
        return $fnum;
}

?>


//去除HTML标记

<?
function Text2Html($txt){
        $txt = str_replace(" ","　",$txt);
        $txt = str_replace("<","&lt;",$txt);
        $txt = str_replace(">","&gt;",$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&#124;https&#124;ftp):///', $feed_url, $protocol);
    $server_url = preg_replace("/(http&#124;https&#124;ftp&#124;news):///", "", $feed_url);
    $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);
    } else {
        $new_content = $content;
    }
    return $new_content;
}

?>


//取得所有链接

<?
function get_all_url($code){
        preg_match_all('/<as+href=["&#124;']?([^>"' ]+)["&#124;']?s*[^>]*>([^>]+)</a>/i',$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) {
        $table = preg_replace("'<td[^>]*?>'si",'"',$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;
        }
        return $td_array;
}

?>


//返回字符串中的所有单词 $distinct=true 去除重复

<?
function split_en_str($str,$distinct=true) {
        preg_match_all('/([a-zA-Z]+)/',$str,$match);
        if ($distinct == true) {
                $match[1] = array_unique($match[1]);
        }
        sort($match[1]);
        return $match[1];
}
?>


//打印出为本PHP项目做出贡献的人员的清单

<?
string phpcredits(void)

?>
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最后编辑： selboo 编辑于2010/08/29 11:36
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