Favorite PHP common function recommendations

Favorite common PHP functions are recommended. Save the following content:

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;
}
?>

The code is as follows:

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;
}

The code is as follows:

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;
}
?>

PHP redirection

The code is as follows:

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

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
?>

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 ();
?>

File format

The code is as follows:

$ 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-Forwarded Cr limit pt ',
'PDF '=> 'application/pdf ',
'Ps' => 'application/postscr reject pt ',
'Eps '=> 'application/postscr reject pt ',
'AI' => 'application/postscr reject pt ',
'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 ',
'Av' => '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-uencode ',
'Uuue' => 'text/x-uencode ',
'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 excel file generation

The code is as follows:

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 ";
// You can change the corresponding file header to export file formats such as .doc. xls.
?>

Time comparison problems
For example, a forum marks a post posted on the day with a new image.
Method 1:

The code is as follows:

// $ Db-> rows [$ I] [date] indicates the datetime field value in the database.
$ Today = time ();
$ TheDay = date ("Y-m-d H: I: s", $ today-24*3600 );
$ NewTag = $ db-> rows [$ I] [date]> = $ theDay? "":"";
// Method 2:
$ NewTag = $ db-> rows [$ I] [date]> = date ("Y-m-d 00:00:00 ")? "":"";
?>

The code is as follows:

// Extract the variables submitted by the page and browser, which is equivalent to enabling PHP. INI to enable global variables.
@ Extract ($ _ SERVER, EXTR_SKIP );
@ Extract ($ _ SESSION, EXTR_SKIP );
@ Extract ($ _ POST, EXTR_SKIP );
@ Extract ($ _ FILES, EXTR_SKIP );
@ Extract ($ _ GET, EXTR_SKIP );
@ Extract ($ _ ENV, EXTR_SKIP );
?>

The code is as follows:

// Read the file function
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;
}
}
?>

The code is as follows:

// File writing function
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;
}
?>

The code is as follows:

// Quick page redirection
Function turntopage ($ url = "index. php", $ info = "page redirection...", $ second = 2 ){
Print"NNPage turning ....N ";
Print" N ";
Print"N ";
Print"NN ";
Print"

N ";Print" N ";Print" N ";Print" N ";Print" N ";Print" N ";Print" N ";Print" N ";Print" N ";Print" N ";Print"

N "; Print" N ";Print" N ";Print" N ";Print" N ";Print" N ";Print" N ";Print" N ";Print" N ";Print" N ";Print" N ";Print"N ";Print" Page redirection prompt information $ Info N "; Print "if your browser does not support automatic jump, click here

N ";
Print"N";
Exit;
?>

Generate random string functions

The code is as follows:

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;
}
?>

Truncate a string of a certain length (this function is valid for GB2312)

The code is as follows:

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;
}
?>

Obtain the client IP address

The code is as follows:

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 );
}
?>

Determine email address

The code is as follows:

Function checkEmail ($ inAddress)
{
Return (ereg ("^ ([a-zA-Z0-9 _-]) + @ ([a-zA-Z0-9 _-]) + (. [a-zA-Z0-9 _-]) +", $ inAddress ));
}
?>

Paging (use with two functions)

The code is as follows:

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 = "total". $ Totalpage ."Page ";
$ 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. = "first page ";
If ($ start> 1)
$ Out. = "... <";
For ($ t = $ start; $ t <= $ end; $ t ++)
{
$ Out. = ($ page = $ t )? "[". $ T."]":" $ T ";
}
If ($ end <$ totalpage)
$ Out. = "> ..";
If ($ page <> $ totalpage)
$ Out. = "Last page ";
Return $ out;
}
?>

Obtain the ID of the newly inserted data

The code is as follows:

Mysql_insert_id ();
?>

The code is as follows:

// Obtain the current script URL
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;
}
?>

The code is as follows:

// Convert the fullwidth number into a halfwidth number
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;
}
?>

The code is as follows:

// Remove HTML tags
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;
}
?>

The code is as follows:

// Convert relative paths to absolute paths
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;
}
?>

The code is as follows:

// Get all links
Function get_all_url ($ code ){
Preg_match_all ('/"'] +) [" | ']? S * [^>] *> ([^>] +)/I ', $ code, $ arr );
Return array ('name' => $ arr [2], 'URL' => $ arr [1]);
}
?>

The code is as follows:

// Convert each line of the HTML table into an array in CSV format
Function get_tr_array ($ table ){
$ Table = preg_replace ("' ] *?> 'Si ", '"', $ table );
$ Table = str_replace ("", '",', $ Table );
$ Table = str_replace (""," {Tr} ", $ table );
// Remove the HTML tag
$ Table = preg_replace ("'<[/!] *? [^ <>] *?> 'Si "," ", $ table );
// Remove the white space characters
$ Table = preg_replace ("'([rn]) [s] +'", "", $ table );
$ Table = str_replace ("", "", $ table );
$ Table = str_replace ("", "", $ table );
$ Table = explode (", {tr}", $ table );
Array_pop ($ table );
Return $ table;
}
?>

The code is as follows:

// Convert each row and column of an HTML table into an array to collect table data
Function get_td_array ($ table ){
$ Table = preg_replace ("' ] *?> 'Si "," ", $ table );
$ Table = preg_replace ("' ] *?> 'Si "," ", $ table );
$ Table = preg_replace ("' ] *?> 'Si "," ", $ table );
$ Table = str_replace (""," {Tr} ", $ table );
$ Table = str_replace (""," {Td} ", $ table );
// Remove the HTML tag
$ Table = preg_replace ("'<[/!] *? [^ <>] *?> 'Si "," ", $ table );
// Remove the white space characters
$ 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;
}
?>

The code is as follows:

// Return all words in the string $ distinct = true to remove duplicates
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];
}
?>

The code is as follows:

// Print out a list of people contributing to this PHP project
String phpcredits (void)
?>