[PHP]经常用到的实用函数集合第1/2页

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
<div class="codetitle"><a style="CURSOR: pointer" data="4308" class="copybut" id="copybut4308" onclick="doCopy('code4308')"> 代码如下:<div class="codebody" id="code4308">
functionGetIP(){//获取IP
if($_SERVER["HTTP_X_FORWARDED_FOR"])
$ip=$_SERVER["HTTP_X_FORWARDED_FOR"];
elseif($_SERVER["HTTP_CLIENT_IP"])
$ip=$_SERVER["HTTP_CLIENT_IP"];
elseif($_SERVER["REMOTE_ADDR"])
$ip=$_SERVER["REMOTE_ADDR"];
elseif(getenv("HTTP_X_FORWARDED_FOR"))
$ip=getenv("HTTP_X_FORWARDED_FOR");
elseif(getenv("HTTP_CLIENT_IP"))
$ip=getenv("HTTP_CLIENT_IP");
elseif(getenv("REMOTE_ADDR"))
$ip=getenv("REMOTE_ADDR");
else
$ip="Unknown";
return$ip;
} functionDateAdd($date,$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]=$int;
returndate("Y-m-d",mktime(0,$dateArr[1]+$value['m'],$dateArr[2]+$value['d'],$dateArr[0]+$value['y']));
} functionGetWeekDay($date){//计算出给出的日期是星期几
$dateArr=explode("-",$date);
returndate("w",$dateArr[1],$dateArr[2],$dateArr[0]));
}

<div class="codetitle"><a style="CURSOR: pointer" data="96022" class="copybut" id="copybut96022" onclick="doCopy('code96022')"> 代码如下:<div class="codebody" id="code96022">
functioncheck_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($dateArr[2])){
returncheckdate($dateArr[1],$dateArr[0]);
}
returnfalse;
}
functioncheck_time($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&&$timeArr[0]<=23)&&($timeArr[1]>=0&&$timeArr[1]<=59)&&($timeArr[2]>=0&&$timeArr[2]<=59))
returntrue;
else
returnfalse;
}
returnfalse;
} functionDateDiff($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;
returnfalse;
}

<div class="codetitle"><a style="CURSOR: pointer" data="73996" class="copybut" id="copybut73996" onclick="doCopy('code73996')"> 代码如下:<div class="codebody" id="code73996">
functionget_innerhtml($html,$label){//获取一对html标记间的html字符串
$result_arr=preg_split("/</".$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;
}
//例:echoget_innerhtml("<tr><tdheight=20>something</td></tr>","td");//willprint"something". functionget_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,1)==""")
returnsubstr($input,1,strpos($input,""",1)-1);
else
returnsubstr($input,"")-1);
}
returnfalse;
} functiongetcontentbetween($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);
returnsubstr($str,$start,strpos($str,$start+1)-$start);
}
returnfalse;
}
1、关于PHP重定向
<div class="codetitle"><a style="CURSOR: pointer" data="13517" class="copybut" id="copybut13517" onclick="doCopy('code13517')"> 代码如下:<div class="codebody" id="code13517">
方法一：header("Location:index.php");
方法二：echo"<scrīpt>window.location="$PHP_SELF";</scrīpt>";
方法三：echo"<METAHTTP-EQUIV="Refresh"CONTENT="0;URL=index.php">";

2、获取访问者浏览器
<div class="codetitle"><a style="CURSOR: pointer" data="94954" class="copybut" id="copybut94954" onclick="doCopy('code94954')"> 代码如下:<div class="codebody" id="code94954">
functionbrowse_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";
$browser="NetscapeNavigator";
}
if(ereg("Mozilla",$Agent)&&ereg("Opera",$Agent);$Part=$temp[1];
$temp=explode(")",$browserver);$browserver=$temp[2];
$browserver=preg_replace("/([d.]+)/",$browserver);
$browserver="$browserver";
$browser="Opera";
}
if(ereg("Mozilla",$Agent)&&ereg("MSIE",$Agent);$Part=$temp[1];
$temp=explode(";",$Part);$Part=$temp[1];
$temp=explode("",$Part);$browserver=$temp[2];
$browserver=preg_replace("/([d.]+)/",$browserver);
$browserver="$browserver";
$browser="InternetExplorer";
}
if($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
<div class="codetitle"><a style="CURSOR: pointer" data="77200" class="copybut" id="copybut77200" onclick="doCopy('code77200')"> 代码如下:<div class="codebody" id="code77200">
functionosinfo(){
$os="";
$Agent=$GLOBALS["HTTP_USER_AGENT"];
if(eregi('win',$Agent)&&strpos($Agent,'95')){
$os="Windows95";
}
elseif(eregi('win9x','4.90')){
$os="WindowsME";
}
elseif(eregi('win',$Agent)&&ereg('98',$Agent)){
$os="Windows98";
}
elseif(eregi('win',$Agent)&&eregi('nt5.0',$Agent)){
$os="Windows2000";
}
elseif(eregi('win',$Agent)&&eregi('nt',$Agent)){
$os="WindowsNT";
}
elseif(eregi('win',$Agent)&&eregi('nt5.1',$Agent)){
$os="WindowsXP";
}
elseif(eregi('win',$Agent)&&ereg('32',$Agent)){
$os="Windows32";
}
elseif(eregi('linux',$Agent)){
$os="Linux";
}
elseif(eregi('unix',$Agent)){
$os="Unix";
}
elseif(eregi('sun',$Agent)&&eregi('os',$Agent)){
$os="SunOS";
}
elseif(eregi('ibm',$Agent)){
$os="IBMOS/2";
}
elseif(eregi('Mac',$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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（编辑：李大同）

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