1. Send Mail using mail function in PHP

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1. $to = "viralpatel.net@gmail.com";  
2. $subject = "VIRALPATEL.net";  
3. $body = "Body of your message here you can use HTML too. e.g. <br> <b> Bold </b>";  
4. $headers = "From: Peter\r\n";  
5. $headers .= "Reply-To: info@yoursite.com\r\n";  
6. $headers .= "Return-Path: info@yoursite.com\r\n";  
7. $headers .= "X-Mailer: PHP5\n";  
8. $headers .= 'MIME-Version: 1.0' . "\n";  
9. $headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";  
10. mail($to,$subject,$body,$headers);  
11. ?>   

$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. Base64 Encode and Decode String in PHP

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1. function base64url_encode($plainText) {  
2.     $base64 = base64_encode($plainText);  
3.     $base64url = strtr($base64, '+/=', '-_,');  
4.     return $base64url;  
5. }  
6.   
7. function base64url_decode($plainText) {  
8.     $base64url = strtr($plainText, '-_,', '+/=');  
9.     $base64 = base64_decode($base64url);  
10.     return $base64;  
11. }   

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. Get Remote IP Address in PHP

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1. function getRemoteIPAddress() {  
2.     $ip = $_SERVER['REMOTE_ADDR'];  
3.     return $ip;  
4. }  

function getRemoteIPAddress() {
	$ip = $_SERVER['REMOTE_ADDR'];
	return $ip;
}

The above code will not work in case your client is behind proxy server. In that case use below function to get real IP address of client.

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1. function getRealIPAddr()  
2. {  
3.     if (!emptyempty($_SERVER['HTTP_CLIENT_IP']))   //check ip from share internet  
4.     {  
5.         $ip=$_SERVER['HTTP_CLIENT_IP'];  
6.     }  
7.     elseif (!emptyempty($_SERVER['HTTP_X_FORWARDED_FOR']))   //to check ip is pass from proxy  
8.     {  
9.         $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];  
10.     }  
11.     else  
12.     {  
13.         $ip=$_SERVER['REMOTE_ADDR'];  
14.     }  
15.     return $ip;  
16. }  

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. Seconds to String

This function will return the duration of the given time period in days, hours, minutes and seconds.
e.g. secsToStr(1234567) would return “14 days, 6 hours, 56 minutes, 7 seconds”

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1. function secsToStr($secs) {  
2.     if($secs>=86400){$days=floor($secs/86400);$secs=$secs%86400;$r=$days.' day';if($days<>1){$r.='s';}if($secs>0){$r.=', ';}}  
3.     if($secs>=3600){$hours=floor($secs/3600);$secs=$secs%3600;$r.=$hours.' hour';if($hours<>1){$r.='s';}if($secs>0){$r.=', ';}}  
4.     if($secs>=60){$minutes=floor($secs/60);$secs=$secs%60;$r.=$minutes.' minute';if($minutes<>1){$r.='s';}if($secs>0){$r.=', ';}}  
5.     $r.=$secs.' second';if($secs<>1){$r.='s';}  
6.     return $r;  
7. }  

function secsToStr($secs) {
	if($secs>=86400){$days=floor($secs/86400);$secs=$secs%86400;$r=$days.' day';if($days<>1){$r.='s';}if($secs>0){$r.=', ';}}
	if($secs>=3600){$hours=floor($secs/3600);$secs=$secs%3600;$r.=$hours.' hour';if($hours<>1){$r.='s';}if($secs>0){$r.=', ';}}
	if($secs>=60){$minutes=floor($secs/60);$secs=$secs%60;$r.=$minutes.' minute';if($minutes<>1){$r.='s';}if($secs>0){$r.=', ';}}
	$r.=$secs.' second';if($secs<>1){$r.='s';}
	return $r;
}

5. Email validation snippet in PHP

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1. $email = $_POST['email'];  
2. if(preg_match("~([a-zA-Z0-9!#$%&'*+-/=?^_`{|}~])@([a-zA-Z0-9-]).([a-zA-Z0-9]{2,4})~",$email)) {  
3.     echo 'This is a valid email.';  
4. } else{  
5.     echo 'This is an invalid email.';  
6. }   

$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. Parsing XML in easy way using PHP

Required Extension: SimpleXML

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1. //this is a sample xml string  
2. $xml_string="<?xml version='1.0'?>  
3. <moleculedb>  
4.     <molecule name='Benzine'>  
5.         <symbol>ben</symbol>  
6.         <code>A</code>  
7.     </molecule>  
8.     <molecule name='Water'>  
9.         <symbol>h2o</symbol>  
10.         <code>K</code>  
11.     </molecule>  
12. </moleculedb>";  
13.   
14. //load the xml string using simplexml function  
15. $xml = simplexml_load_string($xml_string);  
16.   
17. //loop through the each node of molecule  
18. foreach ($xml->molecule as $record)  
19. {  
20.    //attribute are accessted by  
21.    echo $record['name'], '  ';  
22.    //node are accessted by -> operator  
23.    echo $record->symbol, '  ';  
24.    echo $record->code, '<br />';  
25. }  

//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 in PHP

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1. <?php  
2. if(basename(__FILE__) == basename($_SERVER['PHP_SELF'])) send_404();  
3. $dbHost = "localhost";        //Location Of Database usually its localhost  
4. $dbUser = "xxxx";            //Database User Name  
5. $dbPass = "xxxx";            //Database Password  
6. $dbDatabase = "xxxx";       //Database Name  
7.   
8. $db = mysql_connect("$dbHost", "$dbUser", "$dbPass") or die ("Error connecting to database.");  
9. mysql_select_db("$dbDatabase", $db) or die ("Couldn't select the database.");  
10.   
11. # This function will send an imitation 404 page if the user  
12. # types in this files filename into the address bar.  
13. # only files connecting with in the same directory as this  
14. # file will be able to use it as well.  
15. function send_404()  
16. {  
17.     header('HTTP/1.x 404 Not Found');  
18.     print '<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">'."n".  
19.     '<html><head>'."n".  
20.     '<title>404 Not Found</title>'."n".  
21.     '</head><body>'."n".  
22.     '<h1>Not Found</h1>'."n".  
23.     '<p>The requested URL '.  
24.     str_replace(strstr($_SERVER['REQUEST_URI'], '?'), '', $_SERVER['REQUEST_URI']).  
25.     ' was not found on this server.</p>'."n".  
26.     '</body></html>'."n";  
27.     exit;  
28. }  
29.   
30. # In any file you want to connect to the database,  
31. # and in this case we will name this file db.php  
32. # just add this line of php code (without the pound sign):  
33. # include"db.php";  
34. ?>  

<?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. Creating and Parsing JSON data in PHP

Following is the PHP code to create the JSON data format of above example using array of PHP.

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

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

Following code will parse the JSON data into PHP arrays.

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1. $json_string='{"id":1,"name":"rolf","country":"russia","office":["google","oracle"]} ';  
2. $obj=json_decode($json_string);  
3. //print the parsed data  
4. echo $obj->name; //displays rolf  
5. echo $obj->office[0]; //displays google  

$json_string='{"id":1,"name":"rolf","country":"russia","office":["google","oracle"]} ';
$obj=json_decode($json_string);
//print the parsed data
echo $obj->name; //displays rolf
echo $obj->office[0]; //displays google

9. Process MySQL Timestamp in PHP

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1. $query = "select UNIX_TIMESTAMP(date_field) as mydate from mytable where 1=1";  
2. $records = mysql_query($query) or die(mysql_error());  
3. while($row = mysql_fetch_array($records))  
4. {  
5.     echo $row;  
6. }   

$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. Generate An Authentication Code in PHP

This basic snippet will create a random authentication code, or just a random string.

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1. <?php  
2. # This particular code will generate a random string  
3. # that is 25 charicters long 25 comes from the number  
4. # that is in the for loop  
5. $string = "abcdefghijklmnopqrstuvwxyz0123456789";  
6. for($i=0;$i<25;$i++){  
7.     $pos = rand(0,36);  
8.     $str .= $string{$pos};  
9. }  
10. echo $str;  
11. # If you have a database you can save the string in  
12. # there, and send the user an email with the code in  
13. # it they then can click a link or copy the code  
14. # and you can then verify that that is the correct email  
15. # or verify what ever you want to verify  
16. ?>   

<?php
# This particular code will generate a random string
# that is 25 charicters long 25 comes from the number
# that is in the for loop
$string = "abcdefghijklmnopqrstuvwxyz0123456789";
for($i=0;$i<25;$i++){
    $pos = rand(0,36);
    $str .= $string{$pos};
}
echo $str;
# If you have a database you can save the string in
# there, and send the user an email with the code in
# it they then can click a link or copy the code
# and you can then verify that that is the correct email
# or verify what ever you want to verify
?> 

11. Date format validation in PHP

Validate a date in “YYYY-MM-DD” format.

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1. function checkDateFormat($date)  
2. {  
3.     //match the format of the date  
4.     if (preg_match ("/^([0-9]{4})-([0-9]{2})-([0-9]{2})$/", $date, $parts))  
5.     {  
6.         //check weather the date is valid of not  
7.         if(checkdate($parts[2],$parts[3],$parts[1]))  
8.             return true;  
9.         else  
10.         return false;  
11.     }  
12.     else  
13.         return false;  
14. }  

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;
}

12. HTTP Redirection in PHP

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1. <?php  
2.     if (!emptyempty($_SERVER['HTTPS']) && ('on' == $_SERVER['HTTPS'])) {  
3.         $uri = 'https://'; / what?  
4.     } else {  
5.         $uri = 'http://'; / what?  
6.     }  
7.     $uri .= $_SERVER['HTTP_HOST'];  
8.     header('Location: 'http://you_stuff/url.php'); // stick your url here  
9.     exit;  
10. ?>  

<?php
	if (!empty($_SERVER['HTTPS']) && ('on' == $_SERVER['HTTPS'])) {
		$uri = 'https://'; / what?
	} else {
		$uri = 'http://'; / what?
	}
	$uri .= $_SERVER['HTTP_HOST'];
	header('Location: 'http://you_stuff/url.php'); // stick your url here
	exit;
?>

13. Directory Listing in PHP

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1. <?php  
2.   
3. function list_files($dir)  
4. {  
5.     if(is_dir($dir))  
6.     {  
7.         if($handle = opendir($dir))  
8.         {  
9.             while(($file = readdir($handle)) !== false)  
10.             {  
11.                 if($file != "." && $file != ".." && $file != "Thumbs.db"/*pesky windows, images..*/)  
12.                 {  
13.                     echo '<a target="_blank" href="'.$dir.$file.'">'.$file.'</a><br>'."\n";  
14.                 }  
15.             }  
16.             closedir($handle);  
17.         }  
18.     }  
19. }  
20.   
21. /* 
22. To use: 
23.  
24. <?php 
25.     list_files("images/"); 
26. ?> 
27. */  
28. ?>  

<?php

function list_files($dir)
{
	if(is_dir($dir))
  	{
  		if($handle = opendir($dir))
  		{
  			while(($file = readdir($handle)) !== false)
  			{
  				if($file != "." && $file != ".." && $file != "Thumbs.db"/*pesky windows, images..*/)
  				{
  					echo ''.$file.'<br>'."\n";
  				}
  			}
  			closedir($handle);
  		}
	}
}

/*
To use:

<?php
	list_files("images/");
?>
*/
?>

14. Browser Detection script in PHP

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1. <?php  
2.     $useragent = $_SERVER ['HTTP_USER_AGENT'];  
3.     echo "<b>Your User Agent is</b>: " . $useragent;  
4. ?>  

<?php
	$useragent = $_SERVER ['HTTP_USER_AGENT'];
	echo "<b>Your User Agent is</b>: " . $useragent;
?>

15. Unzip a Zip File

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1. <?php  
2.     function unzip($location,$newLocation){  
3.         if(exec("unzip $location",$arr)){  
4.             mkdir($newLocation);  
5.             for($i = 1;$i< count($arr);$i++){  
6.                 $file = trim(preg_replace("~inflating: ~","",$arr[$i]));  
7.                 copy($location.'/'.$file,$newLocation.'/'.$file);  
8.                 unlink($location.'/'.$file);  
9.             }  
10.             return TRUE;  
11.         }else{  
12.             return FALSE;  
13.         }  
14.     }  
15. ?>  
16. //Use the code as following:  
17. <?php  
18. include 'functions.php';  
19. if(unzip('zipedfiles/test.zip','unziped/myNewZip'))  
20.     echo 'Success!';  
21. else  
22.     echo 'Error';  
23. ?>