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分享10段PHP常用代码

　　本文标签：php常用代码,php常用功能

本文汇集PHP开发中经常用到的十段代码，包括Email、64位编码和解码、解压缩、64位编码、解析JSON等，希望对您有所帮助 。

1、使用PHP Mail函数发送Email

$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: Peter\r\n"; 
$headers .= "Reply-To: info@yoursite.com\r\n"; 
$headers .= "Return-Path: info@yoursite.com\r\n"; 
$headers .= "X-Mailer: PHP5\n"; 
$headers .= MIME-Version: 1.0 . "\n"; 
$headers .= Content-type: text/html; charset=iso-8859-1 . "\r\n"; 
mail($to,$subject,$body,$headers); 
?﹥

2、PHP中的64位编码和解码

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;
}

3、获取远程IP地址

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;
}

4、 日期格式化

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;
}

5、验证Email

$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.;
}

6、在PHP中轻松解析XML

//this is a sample xml string
$xml_string="﹤?xml version=1.0?﹥
﹤moleculedb﹥
 ﹤molecule name=Benzine﹥
 ﹤symbol﹥ben﹤/symbol﹥
 ﹤code﹥A﹤/code﹥
 ﹤/molecule﹥
 ﹤molecule name=Water﹥
 ﹤symbol﹥h2o﹤/symbol﹥
 ﹤code﹥K﹤/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 /﹥;
}

7、数据库连接

﹤?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", $db) or die ("Couldnt select the database.");
# This function will send an imitation 404 page if the user
# types in this files filename into the address bar.
# only files connecting with in the same directory as this
# file will be able to use it as well.
function send_404()
{
 header(HTTP/1.x 404 Not Found);
 print ﹤!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"﹥."n".
 ﹤html﹥﹤head﹥."n".
 ﹤title﹥404 Not Found﹤/title﹥."n".
 ﹤/head﹥﹤body﹥."n".
 ﹤h1﹥Not Found﹤/h1﹥."n".
 ﹤p﹥The requested URL .
 str_replace(strstr($_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";
?﹥

8、创建和解析JSON数据

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

9、处理MySQL时间戳

$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;
}

10、解压缩Zip文件

﹤?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;
?﹥

PHP常用功能如下

1.PHP字符串

字符串声明 变量=或者""（一般情况会使用单引号，因为写起来会比较方便）

$str = Hello PHP;
echo $str;

strpos 计算字符在字符串中的位置（从0开始）

$str = Hello PHP;
echo strpos($str,o);  //计算字符在字符串中的位置
echo <br/>;
echo strpos($str,PH);

substr 截取字符串 

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

不传入长度参数的话，会从指定位置一直截取到字符串的末尾

str_split 分割字符串  固定长度的分割（默认长度为1）

$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);

explode(分割字符,待分割的字符串) 按照空格进行分割

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

字符串的连接

$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"; //另一中简便的写法
echo $str2;