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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
"; $headers .= "Reply-To: info@yoursite.com
"; $headers .= "Return-Path: info@yoursite.com
"; $headers .= "X-Mailer: PHP5
"; $headers .= "MIME-Version: 1.0" . "
"; $headers .= "Content-type: text/html; charset=iso-8859-1" . "
"; mail（$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（$date）{//match the format of the dateif （preg_match （"/^（[0-9]{4}）-（[0-9]{2}）-（[0-9]{2}）$/", $date, $parts））{//check weather the date is valid of notif（checkdate（$parts[2],$parts[3],$parts[1]））return true;elsereturn false;}elsereturn 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（$xml_string）;//loop through the each node of moleculeforeach （$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

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

$query = "select UNIX_TIMESTAMP（date_field） as mydatefrom mytable where 1=1";$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:﹤?phpinclude "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;