PHP several useful custom Function summary, PHP Custom Function Summary _php tutorial

PHP several useful custom Function summary, PHP Custom Function Summary

This paper summarizes several useful custom functions of PHP. Share to everyone for your reference, as follows:

Recently looking at the code, found that the following are some of the more useful functions.

1, take the client IP

function Getonlineip () {  $strOnlineIp = "";  if (getenv (' http_client_ip ') && strcasecmp (getenv (' http_client_ip '), ' unknown ') {    $onlineip = getenv (' Http_client_ip ');  } ElseIf (getenv (' http_x_forwarded_for ') && strcasecmp (getenv (' http_x_forwarded_for '), ' unknown ')) {    $ Onlineip = getenv (' http_x_forwarded_for ');  } ElseIf (getenv (' remote_addr ') && strcasecmp (getenv (' remote_addr '), ' unknown ') {    $onlineip = getenv (' Remote_addr ');  } ElseIf (Isset ($_server[' remote_addr ") && $_server[' remote_addr '] && strcasecmp ($_server[' Remote_ ADDR '], ' unknown ') {    $onlineip = $_server[' remote_addr ');  }  Preg_match ("/[\d\.") {7,15}/", $onlineip, $onlineipmatches);  $strOnlineIp = $onlineipmatches [0]? $onlineipmatches [0]: ' Unknown ';  return $strOnlineIp;}

Here, if you use multi-level proxy users, the real IP is not available.

2, string interception, support Chinese

function Getstrtruncate ($string, $length = n, $etc = ") {  if ($length = = 0) return ';  Mb_internal_encoding ("UTF-8");  $string = Str_replace ("\ n", "", $string);  $strlen = Mb_strwidth ($string);  if ($strlen > $length) {    $etclen = mb_strwidth ($etc);    $length = $length-$etclen;    $str = "; $n = 0;    for ($i =0; $i < $length; $i + +) {      $c = Mb_substr ($string, $i, 1);      $n + = Mb_strwidth ($c);      if ($n > $length) {break;}      $str. = $c;    }    return $str. $etc;  } else {    return $string;  }} Echo getstrtruncate ("Submarine Eagle Blog", 7); The result is the seabed, utf8 a Chinese character corresponding to two characters

3, how long ago Time function, forum, blog commonly used

function Timefromnow ($dateline) {  if (Emptyempty ($dateline)) return false;  $seconds = Time ()-$dateline;  if ($seconds <) {    return "1 minutes ago";  } ElseIf ($seconds < 3600) {    return floor ($seconds/60). " Minutes ago ";  } ElseIf ($seconds < 24*3600) {    return floor ($seconds/3600). " Hours ago ";  } ElseIf ($seconds < 48*3600) {    return date ("Yesterday H:i", $dateline). "";  else{    return Date (' y-m-d ', $dateline);}  } Echo Timefromnow (Strtotime ("2012-07-07 14:15:13")); Yesterday 14:15echo Timefromnow (Strtotime ("2012-07-08 14:15:13")); 1 small Front

4, filter part of the label

function Deltags ($str) {  $farr = array (  "/< (\/?) (script|i?frame|style|html|body|title|link|meta|form|input|embed|object|textarea|\?| \%) ([^>]*?) >/isu ",  "/(<[^>]*) on[a-za-z]+\s*= ([^>]*>)/isu "  );  $tarr = Array ("  ",  ""  );  $str = Preg_replace ($farr, $tarr, $str);  return $STR;} $str = "asdfasdfsd===="; Echo deltags ($STR);  Results: Asdfasdfsd====alert (1111) echo strip_tags ($STR); Results: Sdfasdfsd====alert (1111)

If you want to filter all the labels strip_tags is enough.

More interested in PHP related content readers can view the topic: "PHP Basic Grammar Introductory Tutorial", "PHP Object-oriented Programming tutorial" and "PHP common functions and Skills summary"

I hope this article is helpful to you in PHP programming.

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