[PHP] tutorials on page 1/2 _ PHP, a collection of commonly used practical functions

[PHP] 12th pages of a set of commonly used practical functions. I am going to learn about php. I found that many functions are needed and can be written by myself, which is troublesome. so I found common php functions and obtained them from various major php systems, php is definitely the latest practical function used to learn php. I found that many functions need to be used and can be written by myself, which is troublesome. so I found a common function in php, from various major php systems, php practical functions are definitely used.

The code is as follows:

Function GetIP () {// obtain the IP address
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") {// increase of time (you can also improve it to increase by hour, minute, and second, and then add time)
$ 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) {// calculate the day of the week
$ DateArr = explode ("-", $ date );
Return date ("w", mktime (0, 0, 0, $ dateArr [1], $ dateArr [2], $ dateArr [0]);
}

The code is as follows:

Function check_date ($ date) {// check whether the date is valid
$ 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) {// check whether the time is valid
$ 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 = "") {// Time comparison function, returns the seconds, minutes, hours, or days of difference between two dates
Switch ($ unit ){
Case's ':
$ Pidend = 1;
Break;
Case 'I ':
$ Pidend = 60;
Break;
Case 'H ':
$ Pidend = 3600;
Break;
Case 'D ':
$ Pidend = 86400;
Break;
Default:
$ Pidend = 86400;
}
$ Time1 = strtotime ($ date1 );
$ Time2 = strtotime ($ date2 );
If ($ time1 & $ time2)
Return (float) ($ time1-$ time2)/$ pidend;
Return false;
}

The code is as follows:

Function get_innerhtml ($ html, $ label) {// gets an html string between html tags.
$ Result_arr = preg_split ("/<\/". $ label. ">/I", $ html );
$ Pattern = "/<". $ label. ". *?> /I ";
For ($ I = 0; $ I <count ($ result_arr); $ I ++ ){
List ($ left, $ right) = preg_split ($ pattern, $ result_arr [$ I], 2 );
$ Result_arr [$ I] = $ right;
}
Return $ result_arr;
}
// Example: echo get_innerhtml ("Something"," Td "); // will print" something ".

Function get_input_value ($ input) {// obtain the Value in the HTML code of the Input.
$ 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) {// Obtain the string between $ a and $ B in string $ str.
If ($ str! = "" & $! = "" & $ B! = ""){
$ Start = strpos ($ str, $ a) + strlen ($ );
Return substr ($ str, $ start, strpos ($ str, $ B, $ start + 1)-$ start );
}
Return false;
}

1. PHP redirection

The code is as follows:

Method 1: header ("Location: index. php ");
Method 2: echo" Window. location = "$ PHP_SELF "; ";
Method 3: echo" ";

2. obtain the visitor's browser

The code is as follows:

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;
}
// Call method $ browser = browseinfo (); directly return the result

3. obtain the visitor's operating system

The code is as follows:

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 ('netsd', $ Agent )){
$ OS = "NetBSD ";
}
Elseif (eregi ('bsd', $ Agent )){
$ OS = "BSD ";
}
Elseif (ereg ('oss1', $ Agent )){
$ OS = "OSF1 ";
}
Elseif (ereg ('irix ', $ Agent )){
$ OS = "IRIX ";
}
Elseif (eregi ('freebsd ', $ Agent )){
$ OS = "FreeBSD ";
}
If ($ OS = '') $ OS =" Unknown ";
Return $ OS;
}
// Call method $ OS = OS _infor ();

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