php常用函数.

php常用函数.

 

//检查日期是否合法日期
<?
function check_date($date) {
$dateArr = explode(“-“, $date);
if (is_numeric($dateArr[0]) && is_numeric($dateArr[1]) && is_numeric($dateArr[2])) {
return checkdate($dateArr[1],$dateArr[2],$dateArr[0]);
}
return false;
}

//检查时间是否合法时间
function check_time($time) {
$timeArr = explode(“:”, $time);
if (is_numeric($timeArr[0]) && is_numeric($timeArr[1]) && is_numeric($timeArr[2])) {
if (($timeArr[0] >= 0 && $timeArr[0] <= 23) && ($timeArr[1] >= 0 && $timeArr[1] <= 59) && ($timeArr[2] >= 0 && $timeArr[2] <= 59))
return true;
else
return false;
}
return false;
}
//时间比较函数,返回两个日期相差几秒、几分钟、几小时或几天

function DateDiff($date1, $date2, $unit = “”) {
switch ($unit) {
case ‘s':
$dividend = 1;
break;
case ‘i':
$dividend = 60;
break;
case ‘h':
$dividend = 3600;
break;
case ‘d':
$dividend = 86400;
break;
default:
$dividend = 86400;
}
$time1 = strtotime($date1);
$time2 = strtotime($date2);
if ($time1 && $time2)
return (float)($time1 – $time2) / $dividend;
return false;
}

?>

//PHP重定向
<?

//方法一:

header(“Location: index.php”);
//方法二:
echo “<scrīpt>window.location =”$PHP_SELF”;</scrīpt>”;
//方法三:
echo “<META HTTP-EQUIV=’Refresh’ CONTENT=’0; URL=index.php’>”;

?>
//获取IP
<?
function GetIP() {
if ($_SERVER[“HTTP_X_FORWARDED_FOR”])
$ip = $_SERVER[“HTTP_X_FORWARDED_FOR”];
else if ($_SERVER[“HTTP_CLIENT_IP”])
$ip = $_SERVER[“HTTP_CLIENT_IP”];
else if ($_SERVER[“REMOTE_ADDR”])
$ip = $_SERVER[“REMOTE_ADDR”];
else if (getenv(“HTTP_X_FORWARDED_FOR”))
$ip = getenv(“HTTP_X_FORWARDED_FOR”);
else if (getenv(“HTTP_CLIENT_IP”))
$ip = getenv(“HTTP_CLIENT_IP”);
else if (getenv(“REMOTE_ADDR”))
$ip = getenv(“REMOTE_ADDR”);
else
$ip = “Unknown”;
return $ip;
}
?>
<?php
//时间的增加(还可以改进成时分秒都可以增加,有时间再补上)

function DateAdd($date, $int, $unit = “d”) {
$dateArr = explode(“-“, $date);
$value[$unit] = $int;

return date(“Y-m-d”, mktime(0,0,0, $dateArr[1] + $value[‘m’], $dateArr[2] + $value[‘d’], $dateArr[0] + $value[‘y’]));
}

//计算出给出的日期是星期几
function GetWeekDay($date) {
$dateArr = explode(“-“, $date);
return date(“w”, mktime(0,0,0,$dateArr[1],$dateArr[2],$dateArr[0])); 、
}
?>

 

//获取访问者浏览器
<?
function browse_infor()
{
$browser=””;$browserver=””;
$Browsers =array(“Lynx”,”MOSAIC”,”AOL”,”Opera”,”JAVA”,”MacWeb”,”WebExplorer”,”OmniWeb”);
$Agent = $GLOBALS[“HTTP_USER_AGENT”];
for ($i=0; $i<=7; $i++)
{
if (strpos($Agent,$Browsers[$i]))
{
$browser = $Browsers[$i];
$browserver =””;
}
}
if (ereg(“Mozilla”,$Agent) && !ereg(“MSIE”,$Agent))
{
$temp =explode(“(“, $Agent); $Part=$temp[0];
$temp =explode(“/”, $Part); $browserver=$temp[1];
$temp =explode(” “,$browserver); $browserver=$temp[0];
$browserver =preg_replace(“/([d.]+)/”,”1″,$browserver);
$browserver = ” $browserver”;
$browser = “Netscape Navigator”;
}
if (ereg(“Mozilla”,$Agent) && ereg(“Opera”,$Agent))
{
$temp =explode(“(“, $Agent); $Part=$temp[1];
n

$temp =explode(“)”, $Part); $browserver=$temp[1];
$temp =explode(” “,$browserver);$browserver=$temp[2];

 

$browserver =preg_replace(“/([d.]+)/”,”1″,$browserver);
$browserver = ” $browserver”;
$browser = “Opera”;
}
if (ereg(“Mozilla”,$Agent) && ereg(“MSIE”,$Agent))
{
$temp = explode(“(“, $Agent); $Part=$temp[1];
$temp = explode(“;”,$Part); $Part=$temp[1];
$temp = explode(” “,$Part);$browserver=$temp[2];
$browserver =preg_replace(“/([d.]+)/”,”1″,$browserver);
$browserver = ” $browserver”;
$browser = “Internet Explorer”;
}
if ($browser!=””)
{
$browseinfo = “$browser$browserver”;
}
else
{
$browseinfo = “Unknown”;
}
return $browseinfo;
}
//调用方法$browser=browseinfo() ;直接返回结果

?>

 

//文件格式类

<?
$mime_types = array(
‘gif’ => ‘image/gif’,
‘jpg’ => ‘image/jpeg’,
‘jpeg’ => ‘image/jpeg’,
‘jpe’ => ‘image/jpeg’,
‘bmp’ => ‘image/bmp’,
‘png’ => ‘image/png’,
‘tif’ => ‘image/tiff’,
‘tiff’ => ‘image/tiff’,
‘pict’ => ‘image/x-pict’,
‘pic’ => ‘image/x-pict’,
‘pct’ => ‘image/x-pict’,
‘tif’ => ‘image/tiff’,
‘tiff’ => ‘image/tiff’,
‘psd’ => ‘image/x-photoshop’,

‘swf’ => ‘application/x-shockwave-flash’,
‘js’ => ‘application/x-javascrīpt’,
‘pdf’ => ‘application/pdf’,
‘ps’ => ‘application/postscrīpt’,
‘eps’ => ‘application/postscrīpt’,
‘ai’ => ‘application/postscrīpt’,
‘wmf’ => ‘application/x-msmetafile’,

‘css’ => ‘text/css’,
‘htm’ => ‘text/html’,
‘html’ => ‘text/html’,
‘txt’ => ‘text/plain’,

‘xml’ => ‘text/xml’,
‘wml’ => ‘text/wml’,
‘wbmp’ => ‘image/vnd.wap.wbmp’,

‘mid’ => ‘audio/midi’,
‘wav’ => ‘audio/wav’,
‘mp3′ => ‘audio/mpeg’,
‘mp2′ => ‘audio/mpeg’,

‘avi’ => ‘video/x-msvideo’,
‘mpeg’ => ‘video/mpeg’,
‘mpg’ => ‘video/mpeg’,
‘qt’ => ‘video/quicktime’,
‘mov’ => ‘video/quicktime’,

‘lha’ => ‘application/x-lha’,
‘lzh’ => ‘application/x-lha’,
‘z’ => ‘application/x-compress’,
‘gtar’ => ‘application/x-gtar’,
‘gz’ => ‘application/x-gzip’,
‘gzip’ => ‘application/x-gzip’,
‘tgz’ => ‘application/x-gzip’,
‘tar’ => ‘application/x-tar’,
‘bz2′ => ‘application/bzip2′,
‘zip’ => ‘application/zip’,
‘arj’ => ‘application/x-arj’,
‘rar’ => ‘application/x-rar-compressed’,

 

‘hqx’ => ‘application/mac-binhex40′,
‘sit’ => ‘application/x-stuffit’,
‘bin’ => ‘application/x-macbinary’,

‘uu’ => ‘text/x-uuencode’,
‘uue’ => ‘text/x-uuencode’,

‘latex’=> ‘application/x-latex’,
‘ltx’ => ‘application/x-latex’,
‘tcl’ => ‘application/x-tcl’,

‘pgp’ => ‘application/pgp’,
‘asc’ => ‘application/pgp’,
‘exe’ => ‘application/x-msdownload’,
‘doc’ => ‘application/msword’,

 

‘rtf’ => ‘application/rtf’,
‘xls’ => ‘application/vnd.ms-excel’,
‘ppt’ => ‘application/vnd.ms-powerpoint’,
‘mdb’ => ‘application/x-msaccess’,
‘wri’ => ‘application/x-mswrite’,
);

?>
//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’>”:””;

?>

 

//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;
?>

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;
}

?>

 

 

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;
}

?>

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);
}

?>

//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);
$fnum = ereg_replace(“[^0-9.]|^0{1,}”,””,$fnum);
if($fnum==””) $fnum=0;
return $fnum;
}

?>

分页(两个函数配合使用)
<?
function getpage($sql,$page_size=20)
{
global $page,$totalpage,$sums;
$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;
}

?>

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

?>

 

 

 

//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);

$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;
}

?>

 

 
//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|https|ftp):///’, $feed_url, $protocol);
$server_url = preg_replace(“/(http|https|ftp|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($code){
preg_match_all(‘/<as+href=[“|’]?([^>”‘ ]+)[“|’]?s*[^>]*>([^>]+)</a>/i’,$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;
}

?>

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