分享10段PHP常用代码


            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 ("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 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;