Giới thiệu tới các bạn các đoạn code hay dùng nhất trong lập trình php.nên tham khảo bổ sung kiến thức webbsite cho bạn.
1. Send Mail using mail function in PHP

Trích:

01 $to = "admin@user.vn";
02 $subject = "User.vn";
03 $body = "Body of your message here you can use HTML too. e.g.
Bold ";
04 $headers = "From: Peter";
05 $headers .= "Reply-To: info@yoursite.com";
06 $headers .= "Return-Path: mailto:info@yoursite.com";
07 $headers .= "X-Mailer:PHP5";
08 $headers .= 'MIME-Version: 1.0";
09 $headers .= 'Content-type: text/html; charset=iso-8859-1";
10 mail($to,$subject,$body,$headers);

2. Base64 Encode and Decode String in PHP

Trích:

01 function base64url_encode($plainText) {
02 $base64 = base64_encode($plainText);
03 $base64url = strtr($base64, '+/=', '-_,');
04 return $base64url;
05 }
06
07 function base64url_decode($plainText) {
08 $base64url = strtr($plainText, '-_,', '+/=');
09 $base64 = base64_decode($base64url);
10 return $base64;
11 }

3. Get Remote IP Address in PHP

Trích:

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

Nếu người truy cập web cố tình dấu địa chỉ ip này bằng proxy thì sử dụng code sau :

Trích:

01 function getRealIPAddr()
02 {
03 if (!empty($_SERVER['HTTP_CLIENT_IP'])) //check ip from
04 {
05 $ip=$_SERVER['HTTP_CLIENT_IP'];
06 }
07 elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
08 //to check ip is pass from proxy
09 {
10 $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
11 }
12 else
13 {
14 $ip=$_SERVER['REMOTE_ADDR'];
15 }
16 return $ip;
17 }

4. Seconds to String

Trích:

01 function secsToStr($secs) {
02 if($secs>=86400){$days=floor($secs/86400);$secs=$secs%86400;
03 $r=$days.' day';
04 if($days<>1){$r.='s';}if($secs>0){$r.=', ';}}
05 if($secs>=3600){$hours=floor($secs/3600);$secs=$secs%3600;
06 $r.=$hours.' hour';
07 if($hours<>1){$r.='s';}if($secs>0){$r.=', ';}}
08 if($secs>=60){$minutes=floor($secs/60);$secs=$secs%60;
09 $r.=$minutes.' minute';
10 if($minutes<>1){$r.='s';}if($secs>0){$r.=', ';}}
11 $r.=$secs.' second';if($secs<>1){$r.='s';}
12 return $r;
13 }

5. Email validation snippet in PHP

Trích:

1 $email = $_POST['email'];
2 if(preg_match("~([a-zA-Z0-9!#$%&'*+-/=?^_`{|}~])@
3 ([a-zA-Z0-9-]).([a-zA-Z0-9]{2,4})~",$email)) {
4 echo 'This is a valid email.';
5 } else{
6 echo 'This is an invalid email.';
7 }

6. Parsing XML in easy way using PHP

Trích:

01 //this is a sample xml string
02 $xml_string="
03
04
05 ben
06 A
07
08
09 h2o
10 K
11
12 ";
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, '
';
25 }

7. Database Connection in PHP

Trích:

01 if(basename(__FILE__) == basename($_SERVER['PHP_SELF'])) send_404();
02 $dbHost = "localhost"; //Location Of Database usually its localhost
03 $dbUser = "xxxx"; //Database User Name
04 $dbPass = "xxxx"; //Database Password
05 $dbDatabase = "xxxx"; //Database Name
06
07 $db = mysql_connect("$dbHost", "$dbUser", "$dbPass")
08 or die ("Error connecting to database.");
09 mysql_select_db("$dbDatabase", $db)
10 or die ("Couldn't select the database.");
11
12 # This function will send an imitation 404 page if the user
13 # types in this files filename into the address bar.
14 # only files connecting with in the same directory as this
15 # file will be able to use it as well.
16 function send_404()
17 {
18 header('HTTP/1.x 404 Not Found');
19 print ''."n".
20 ''."n".
21 '404 Not Found'."n".
22 ''."n".
23 '

Not Found

'."n".
24 '

The requested URL '.
25
26 str_replace(strstr($_SERVER['REQUEST_URI'], '?'),
27 '', $_SERVER['REQUEST_URI']).
28 ' was not found on this server.

'."n".
29 ''."n";
30 exit;
31 }
32
33 # In any file you want to connect to the database,
34 # and in this case we will name this file db.php
35 # just add this line of php code (without the pound sign):
36 # include"db.php";

8. Creating and Parsing JSON data in PHP

Trích:

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

Sử dụng mảng $json_string=’{“id”:1,”name”:”rolf”, ”country”:”rus sia”,”office”:
["google","oracle"]} ‘;

Trích:

1 $obj=json_decode($json_string);
2 //print the parsed data
3 echo $obj->name; //displays rolf
4 echo $obj->office[0]; //displays google

9. Process MySQL Timestamp in PHP

Trích:

1 $query = "select UNIX_TIMESTAMP(date_field) as mydate
2 from mytable where 1=1";
3 $records = mysql_query($query) or die(mysql_error());
4 while($row = mysql_fetch_array($records))
5 {
6 echo $row;
7 }

10. Generate An Authentication Code in PHP

Trích:

01 # This particular code will generate a random string
02
03 # that is 25 charicters long 25 comes from the number
04
05 # that is in the for loop
06
07 $string = "abcdefghijklmnopqrstuvwxyz0123456789";
08
09 for($i=0;$i<25;$i++){
10
11 $pos = rand(0,36);
12
13 $str .= $string{$pos};
14
15 }
16
17 echo $str;
18
19 # If you have a database you can save the string in
20
21 # there, and send the user an email with the code in
22
23 # it they then can click a link or copy the code
24
25 # and you can then verify that that is the correct email
26
27 # or verify what ever you want to verify

11. Date format validation in PHP

Trích:

01 function checkDateFormat($date)
02 {
03 //match the format of the date
04 if (preg_match ("/^([0-9]{4})-([0-9]{2})-([0-9]{2})$/",
05 $date, $parts))
06 {
07 //check weather the date is valid of not
08 if(checkdate($parts[2],$parts[3],$parts[1]))
09 return true;
10 else
11 return false;
12 }
13 else
14 return false;
15 }

12. HTTP Redirection in PHP

Trích:

1 header('Location: 'http://you_stuff/url.php');

13. Directory Listing in PHP

Trích:

01 function list_files($dir)
02 {
03 if(is_dir($dir))
04 {
05 if($handle = opendir($dir))
06 {
07 while(($file = readdir($handle)) !== false)
08 {
09 /*pesky windows, images..*/
10 if($file != "." && $file != ".." && $file != "Thumbs.db")
11 {
12 echo '
13 '.$file.'
'."";
14 }
15 }
16 closedir($handle);
17 }
18 }
19 }
20 /*
21 To use:
22
23 24
25 list_files("images/");
26
27 ?>
28
29 */

14. Browser Detection script in PHP

Trích:

1 $useragent = $_SERVER ['HTTP_USER_AGENT'];
2 echo "Your User Agent is: " . $useragent;

15. Unzip a Zip File

Trích:

01 function unzip($location,$newLocation){
02 if(exec("unzip $location",$arr)){
03 mkdir($newLocation);
04 for($i = 1;$i< count($arr);$i++){
05 $file = trim(preg_replace("~inflating: ~","",$arr[$i]));
06 copy($location.'/'.$file,$newLocation.'/'.$file);
07 unlink($location.'/'.$file);
08 }
09 return TRUE;
10 }else{
11 return FALSE;
12 }
13 }

Use the code as following:

Trích:

1 include 'functions.php';
2 if(unzip('zipedfiles/test.zip','unziped/myNewZip'))
3 echo 'Success!';
4 else
5 echo 'Error';

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