分享10段PHP常用代码

$to = "viralpatel.net@gmail.com"; 
$subject = "VIRALPATEL.net"; 
$body = "Body of your message here you can use HTML too. e.g. br b Bold /b"; 
$headers = "From: Peterrn"; 
$headers .= "Reply-To: info@yoursite.comrn"; 
$headers .= "Return-Path: info@yoursite.comrn"; 
$headers .= "X-Mailer: PHP5n"; 
$headers .= 'MIME-Version: 1.0' . "n"; 
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "rn"; 
mail($to,$subject,$body,$headers); 
?

function base64url_encode($plainText) {
$base64 = base64_encode($plainText);
$base64url = strtr($base64,'+/=','-_,');
return $base64url;
}
function base64url_decode($plainText) {
$base64url = strtr($plainText,','+/=');
$base64 = base64_decode($base64url);
return $base64;
} 

function getRealIPAddr()
{
if (!empty($_SERVER['HTTP_CLIENT_IP'])) //check ip from share internet
{
$ip=$_SERVER['HTTP_CLIENT_IP'];
}
elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) //to check ip is pass from proxy
{
$ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
}
else
{
$ip=$_SERVER['REMOTE_ADDR'];
}
return $ip;
}

function checkDateFormat($date)
{
//match the format of the date
if (preg_match ("/^([0-9]{4})-([0-9]{2})-([0-9]{2})$/",$date,$parts))
{
//check weather the date is valid of not
if(checkdate($parts[2],$parts[3],$parts[1]))
return true;
else
return false;
}
else
return false;
}

$email = $_POST['email'];
if(preg_match("~([a-zA-Z0-9!#$%&'*+-/=?^_`{|}~])@([a-zA-Z0-9-]).
   ([a-zA-Z0-9]{2,4})~",$email)) {
echo 'This is a valid email.';
} else{
echo 'This is an invalid email.';
}

//this is a sample xml string
$xml_string="?xml version='1.0'?
moleculedb
 molecule name='Benzine'
 symbolben/symbol
 codeA/code
 /molecule
 molecule name='Water'
 symbolh2o/symbol
 codeK/code
 /molecule
/moleculedb";
//load the xml string using simplexml function
$xml = simplexml_load_string($xml_string);
//loop through the each node of molecule
foreach ($xml-molecule as $record)
{
 //attribute are accessted by
 echo $record['name'],' ';
 //node are accessted by - operator
 echo $record-symbol,' ';
 echo $record-code,'br /';
}

?php
if(basename(__FILE__) == basename($_SERVER['PHP_SELF'])) send_404();
$dbHost = "localhost"; //Location Of Database usually its localhost
$dbUser = "xxxx"; //Database User Name
$dbPass = "xxxx"; //Database Password
$dbDatabase = "xxxx"; //Database Name
$db = mysql_connect("$dbHost","$dbUser","$dbPass") or 
   die ("Error connecting to database.");
mysql_select_db("$dbDatabase",$db) or die ("Couldn't select the database.");
# This function will send an imitation 404 page if the user
# types in this files filename into the address bar.
# only files connecting with in the same directory as this
# file will be able to use it as well.
function send_404()
{
 header('HTTP/1.x 404 Not Found');
 print '!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"'."n".
 'htmlhead'."n".
 'title404 Not Found/title'."n".
 '/headbody'."n".
 'h1Not Found/h1'."n".
 'pThe requested URL '.
 str_replace(strstr($_SERVER['REQUEST_URI'],'?'),'',$_SERVER['REQUEST_URI']).
 ' was not found on this server./p'."n".
 '/body/html'."n";
 exit;
}
# In any file you want to connect to the database,# and in this case we will name this file db.php
# just add this line of php code (without the pound sign):
# include"db.php";
?

$json_data = array ('id'=1,'name'="rolf",'country'='russia',"office"=array("google","oracle"));
echo json_encode($json_data);

$query = "select UNIX_TIMESTAMP(date_field) as mydate 
 from mytable where 1=1";
$records = mysql_query($query) or die(mysql_error());
while($row = mysql_fetch_array($records))
{
echo $row;
}

?php
 function unzip($location,$newLocation){
 if(exec("unzip $location",$arr)){
 mkdir($newLocation);
 for($i = 1;$i count($arr);$i++){
 $file = trim(preg_replace("~inflating: ~","",$arr[$i]));
 copy($location.'/'.$file,$newLocation.'/'.$file);
 unlink($location.'/'.$file);
 }
 return TRUE;
 }else{
 return FALSE;
 }
 }
?
//Use the code as following:
?php
include 'functions.php';
if(unzip('zipedfiles/test.zip','unziped/myNewZip'))
 echo 'Success!';
else
 echo 'Error';
?

$str = 'Hello PHP';
//截取字符串
$str1 = substr($str,2,3); //从2地位开始截取,截取长度为3的字符串
echo $str1;

$str = 'Hello PHP';
//分割字符串
$result = str_split($str); //将结果保存到一个数组中
print_r($result); //使用print_r输入一个数组
echo '<br/>';
$result1 = str_split($str,2);
print_r($result1);

$str = 'Hello PHP Java C# C++';
$result = explode(' ',$str);
print_r($result);

$str = 'Hello PHP Java C# C++';
//字符串的连接
$num = 100;
$str1 = $str.'<br/>Objective-C '.$num;
echo $str1;
echo '<br/>';
$str2 = "$str<br/>Objective-C $num"; //另一中轻便的写法
echo $str2;