Share 10 common PHP codes and share 10 php_PHP tutorials

Share 10 pieces of commonly used PHP code, share 10 pieces of php

This article collects ten pieces of code frequently used in PHP development, including Email, 64-bit encoding and decoding, and decompression , 64-bit encoding, parsing JSON, etc. I hope it will be helpful to you.

1. Use PHP Mail function to send 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. 64-bit encoding and decoding in PHP

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. Obtain the remote IP address

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. Date formatting

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. Verification 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. Easily parse XML in PHP

//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. Database connection

﹤?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. Create and parse JSON data

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

9. Processing MySQL timestamps

$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. Decompress the Zip file

﹤?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';
?﹥

Common functions of PHP are as follows

1.PHP string

String declaration variable ='' or "" (usually single quotes are used because it is more convenient to write)

$str = 'Hello PHP';
echo $str;

strpos calculates the position of the character in the string (starting from 0)

$str = 'Hello PHP';
echo strpos($str,'o'); //Calculate the position of the character in the string
echo '
';
echo strpos($str,'PH');

substr intercepts the string

$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;

If the length parameter is not passed in, it will be intercepted from the specified position to the end of the string

str_split splits string fixed-length split (default length is 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 (split character, string to be split) Split according to spaces

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

Concatenation of strings

$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;

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