非常实用的PHP常用函数汇总

<?php

/**

* 获取客户端IP

* @return [string] [description]

*/

functiongetClientIp() {

$ip= NULL;

if(isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {

$arr=explode(',',$_SERVER['HTTP_X_FORWARDED_FOR']);

$pos=array_search('unknown',$arr);

if(false !==$pos) unset($arr[$pos]);

$ip= trim($arr[0]);

}elseif(isset($_SERVER['HTTP_CLIENT_IP'])) {

$ip=$_SERVER['HTTP_CLIENT_IP'];

}elseif(isset($_SERVER['REMOTE_ADDR'])) {

$ip=$_SERVER['REMOTE_ADDR'];

}

// IP地址合法验证

$ip= (false !==ip2long($ip)) ?$ip:'0.0.0.0';

return$ip;

}

/**

* 获取在线IP

* @return String

*/

functiongetOnlineIp($format=0) {

global$S_GLOBAL;

if(empty($S_GLOBAL['onlineip'])) {

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);

$S_GLOBAL['onlineip'] =$onlineipmatches[0] ?$onlineipmatches[0] :'unknown';

}

if($format) {

$ips=explode('.',$S_GLOBAL['onlineip']);

for($i=0;$i<3;$i++) {

$ips[$i] =intval($ips[$i]);

}

returnsprintf('%03d%03d%03d',$ips[0],$ips[1],$ips[2]);

}else{

return$S_GLOBAL['onlineip'];

}

}

/**

* 获取url

* @return [type] [description]

*/

functiongetUrl(){

$pageURL='http';

if(isset($_SERVER["HTTPS"]) &&$_SERVER["HTTPS"] =="on") {

$pageURL.="s";

}

$pageURL.="://";

if($_SERVER["SERVER_PORT"] !="80") {

$pageURL.=$_SERVER["HTTP_HOST"] .":".$_SERVER["SERVER_PORT"] .$_SERVER["REQUEST_URI"];

}else{

$pageURL.=$_SERVER["HTTP_HOST"] .$_SERVER["REQUEST_URI"];

}

return$pageURL;

}

/**

* 获取当前站点的访问路径根目录

* @return [type] [description]

*/

functiongetSiteUrl() {

$uri=$_SERVER['REQUEST_URI']?$_SERVER['REQUEST_URI']:($_SERVER['PHP_SELF']?$_SERVER['PHP_SELF']:$_SERVER['SCRIPT_NAME']);

return'http://'.$_SERVER['HTTP_HOST'].substr($uri, 0,strrpos($uri,'/')+1);

}

/**

* 字符串截取，支持中文和其他编码

* @param [string] $str [字符串]

* @param integer $start [起始位置]

* @param integer $length [截取长度]

* @param string $charset [字符串编码]

* @param boolean $suffix [是否有省略号]

* @return [type] [description]

*/

functionmsubstr($str,$start=0,$length=15,$charset="utf-8",$suffix=true) {

if(function_exists("mb_substr")) {

returnmb_substr($str,$start,$length,$charset);

}elseif(function_exists('iconv_substr')) {

returniconv_substr($str,$start,$length,$charset);

}

$re['utf-8'] ="/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";

$re['gb2312'] ="/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/";

$re['gbk'] ="/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/";

$re['big5'] ="/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";

preg_match_all($re[$charset],$str,$match);

$slice= join("",array_slice($match[0],$start,$length));

if($suffix) {

return$slice."…";

}

return$slice;

}

/**

* php 实现js escape 函数

* @param [type] $string [description]

* @param string $encoding [description]

* @return [type] [description]

*/

functionescape($string,$encoding='UTF-8'){

$return= null;

for($x= 0;$x< mb_strlen($string,$encoding);$x++)

{

$str= mb_substr($string,$x, 1,$encoding);

if(strlen($str) > 1) {// 多字节字符

$return.="%u".strtoupper(bin2hex(mb_convert_encoding($str,'UCS-2',$encoding)));

}else{

$return.="%".strtoupper(bin2hex($str));

}

}

return$return;

}

/**

* php 实现 js unescape函数

* @param [type] $str [description]

* @return [type] [description]

*/

functionunescape($str) {

$str= rawurldecode($str);

preg_match_all("/(?:%u.{4})|.{4};|&#\d+;|.+/U",$str,$r);

$ar=$r[0];

foreach($aras$k=>$v) {

if(substr($v,0,2) =="%u"){

$ar[$k] = iconv("UCS-2","utf-8//IGNORE",pack("H4",substr($v,-4)));

}elseif(substr($v,0,3) =="") {

$ar[$k] = iconv("UCS-2","utf-8",pack("H4",substr($v,3,-1)));

}elseif(substr($v,0,2) =="&#") {

echosubstr($v,2,-1)."";

$ar[$k] = iconv("UCS-2","utf-8",pack("n",substr($v,2,-1)));

}

}

returnjoin("",$ar);

}

/**

* 数字转人名币

* @param [type] $num [description]

* @return [type] [description]

*/

functionnum2rmb ($num) {

$c1="零壹贰叁肆伍陆柒捌玖";

$c2="分角元拾佰仟万拾佰仟亿";

$num=round($num, 2);

$num=$num* 100;

if(strlen($num) > 10) {

return"oh,sorry,the number is too long!";

}

$i= 0;

$c="";

while(1) {

if($i== 0) {

$n=substr($num,strlen($num)-1, 1);

}else{

$n=$num% 10;

}

$p1=substr($c1, 3 *$n, 3);

$p2=substr($c2, 3 *$i, 3);

if($n!='0'|| ($n=='0'&& ($p2=='亿'||$p2=='万'||$p2=='元'))) {

$c=$p1.$p2.$c;

}else{

$c=$p1.$c;

}

$i=$i+ 1;

$num=$num/ 10;

$num= (int)$num;

if($num== 0) {

break;

}

}

$j= 0;

$slen=strlen($c);

while($j<$slen) {

$m=substr($c,$j, 6);

if($m=='零元'||$m=='零万'||$m=='零亿'||$m=='零零') {

$left=substr($c, 0,$j);

$right=substr($c,$j+ 3);

$c=$left.$right;

$j=$j-3;

$slen=$slen-3;

}

$j=$j+ 3;

}

if(substr($c,strlen($c)-3, 3) =='零') {

$c=substr($c, 0,strlen($c)-3);

}// if there is a '0' on the end , chop it out

return$c."整";

}

/**

* 特殊的字符

* @param [type] $str [description]

* @return [type] [description]

*/

functionmakeSemiangle($str) {

$arr=array(

'０'=>'0','１'=>'1','２'=>'2','３'=>'3','４'=>'4',

'５'=>'5','６'=>'6','７'=>'7','８'=>'8','９'=>'9',

'Ａ'=>'A','Ｂ'=>'B','Ｃ'=>'C','Ｄ'=>'D','Ｅ'=>'E',

'Ｆ'=>'F','Ｇ'=>'G','Ｈ'=>'H','Ｉ'=>'I','Ｊ'=>'J',

'Ｋ'=>'K','Ｌ'=>'L','Ｍ'=>'M','Ｎ'=>'N','Ｏ'=>'O',

'Ｐ'=>'P','Ｑ'=>'Q','Ｒ'=>'R','Ｓ'=>'S','Ｔ'=>'T',

'Ｕ'=>'U','Ｖ'=>'V','Ｗ'=>'W','Ｘ'=>'X','Ｙ'=>'Y',

'Ｚ'=>'Z','ａ'=>'a','ｂ'=>'b','ｃ'=>'c','ｄ'=>'d',

'ｅ'=>'e','ｆ'=>'f','ｇ'=>'g','ｈ'=>'h','ｉ'=>'i',

'ｊ'=>'j','ｋ'=>'k','ｌ'=>'l','ｍ'=>'m','ｎ'=>'n',

'ｏ'=>'o','ｐ'=>'p','ｑ'=>'q','ｒ'=>'r','ｓ'=>'s',

'ｔ'=>'t','ｕ'=>'u','ｖ'=>'v','ｗ'=>'w','ｘ'=>'x',

'ｙ'=>'y','ｚ'=>'z',

'（'=>'(','）'=>')','〔'=>'[','〕'=>']','【'=>'[',

'】'=>']','〖'=>'[','〗'=>']','｛'=>'{','｝'=>'}','《'=>'<',

'》'=>'>',

'％'=>'%','＋'=>'+','—'=>'-','－'=>'-','～'=>'-',

'：'=>':','。'=>'.','、'=>',','，'=>'.','、'=>'.',

'；'=>';','？'=>'?','！'=>'!','…'=>'-','‖'=>'|',

'”'=>'"','“'=>'"',''' => '`', '‘' => '`', '｜' => '|', '〃' => '"',

'　'=>' ','．'=>'.');

returnstrtr($str,$arr);

}

/**

* 下载

* @param [type] $filename [description]

* @param string $dir [description]

* @return [type] [description]

*/

functiondownloads($filename,$dir='./'){

$filepath=$dir.$filename;

if(!file_exists($filepath)){

header("Content-type: text/html; charset=utf-8");

echo"File not found!";

exit;

}else{

$file=fopen($filepath,"r");

Header("Content-type: application/octet-stream");

Header("Accept-Ranges: bytes");

Header("Accept-Length: ".filesize($filepath));

Header("Content-Disposition: attachment; filename=".$filename);

echofread($file,filesize($filepath));

fclose($file);

}

}

/**

* 创建一个目录树

* @param [type] $dir [description]

* @param integer $mode [description]

* @return [type] [description]

*/

functionmkdirs($dir,$mode= 0777) {

if(!is_dir($dir)) {

mkdirs(dirname($dir),$mode);

returnmkdir($dir,$mode);

}

returntrue;

}