收藏的PHP常用函数 推荐收藏保存


Posted in PHP onFebruary 21, 2010

内容:

<? 
function GetIP() { //获取IP 
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 
function DateAdd($date, $int, $unit = "d") { //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) 
$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] + $value['y'])); 
} 
function GetWeekDay($date) { //计算出给出的日期是星期几 
$dateArr = explode("-", $date); 
return date("w", mktime(0,0,0,$dateArr[1],$dateArr[2],$dateArr[0])); 
} 
?>

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

function DateDiff($date1, $date2, $unit = "") { //时间比较函数,返回两个日期相差几秒、几分钟、几小时或几天 
switch ($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]; 
$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 
?>

获取访问者操作系统
<? 
function osinfo() { 
$os=""; 
$Agent = $GLOBALS["HTTP_USER_AGENT"]; 
if (eregi('win',$Agent) && strpos($Agent, '95')) { 
$os="Windows 95"; 
} 
elseif (eregi('win 9x',$Agent) && strpos($Agent, '4.90')) { 
$os="Windows ME"; 
} 
elseif (eregi('win',$Agent) && ereg('98',$Agent)) { 
$os="Windows 98"; 
} 
elseif (eregi('win',$Agent) && eregi('nt 5.0',$Agent)) { 
$os="Windows 2000"; 
} 
elseif (eregi('win',$Agent) && eregi('nt',$Agent)) { 
$os="Windows NT"; 
} 
elseif (eregi('win',$Agent) && eregi('nt 5.1',$Agent)) { 
$os="Windows XP"; 
} 
elseif (eregi('win',$Agent) && ereg('32',$Agent)) { 
$os="Windows 32"; 
} 
elseif (eregi('linux',$Agent)) { 
$os="Linux"; 
} 
elseif (eregi('unix',$Agent)) { 
$os="Unix"; 
} 
elseif (eregi('sun',$Agent) && eregi('os',$Agent)) { 
$os="SunOS"; 
} 
elseif (eregi('ibm',$Agent) && eregi('os',$Agent)) { 
$os="IBM OS/2"; 
} 
elseif (eregi('Mac',$Agent) && eregi('PC',$Agent)) { 
$os="Macintosh"; 
} 
elseif (eregi('PowerPC',$Agent)) { 
$os="PowerPC"; 
} 
elseif (eregi('AIX',$Agent)) { 
$os="AIX"; 
} 
elseif (eregi('HPUX',$Agent)) { 
$os="HPUX"; 
} 
elseif (eregi('NetBSD',$Agent)) { 
$os="NetBSD"; 
} 
elseif (eregi('BSD',$Agent)) { 
$os="BSD"; 
} 
elseif (ereg('OSF1',$Agent)) { 
$os="OSF1"; 
} 
elseif (ereg('IRIX',$Agent)) { 
$os="IRIX"; 
} 
elseif (eregi('FreeBSD',$Agent)) { 
$os="FreeBSD"; 
} 
if ($os=='') $os = "Unknown"; 
return $os; 
} 
//调用方法$os=os_infor() ; 
?>

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'>":""; 
?>

//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
<? 
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); 
$fnum = ereg_replace("[^0-9.]|^0{1,}","",$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); 
$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; 
} 
?>

//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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