[PHP]经常用到的实用函数集合第1/2页_PHP教程

最新打算学习php,发现好多函数需要用到，可自己写又麻烦，于是找了下php的常用函数，从各大php系统中弄下来的，绝对是使用的php实用函数

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;
}

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] = 0 && $timeArr[1] = 0 && $timeArr[2] 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;
}

function get_innerhtml($html,$label) { //获取一对html标记间的html字符串
$result_arr = preg_split("//i",$html);
$pattern = "//i";
for ($i = 0; $i list($left, $right) = preg_split($pattern,$result_arr[$i],2);
$result_arr[$i] = $right;
}
return $result_arr;
}
//例: echo get_innerhtml("something", "td"); //will print "something".

function get_input_value($input) { //获取Input的HTML代码中的Value值
$pos = stripos($input, "value=") + 6;
if ($pos !== false) {
$input = substr($input, $pos);
if (substr($input, 0, 1) == "\"")
return substr($input, 1, strpos($input, "\"", 1) - 1);
else
return substr($input, 0, strpos($input, " ") - 1);
}
return false;
}

function getcontentbetween($a, $b, $str) { //获取字符串$str中,字符串$a与字符串$b之间的字符串
if ($str!=="" && $a!=="" && $b!=="") {
$start = strpos($str, $a) + strlen($a);
return substr($str, $start, strpos($str, $b, $start + 1) - $start);
}
return false;
}

1、关于PHP重定向

方法一：header("Location: index.php");
方法二：echo "window.location ="$PHP_SELF";īpt>";
方法三：echo "";

2、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; $i{
if (strpos($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

3、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() ;

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