15 code php hay dùng trong lập trình website

1. Send Mail using mail function in PHP Code: $to = "admin@user.vn"; $subject = "User.vn"; $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: mailto: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,$headers); 2. Base64 Encode and Decode String in PHP Code: 01 function base64url_encode($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 Code: 1 function getRemoteIPAddress() { 2 $ip = $_SERVER['REMOTE_ADDR']; 3 return $ip; 4 } Nếu người truy cập web cố tình dấu địa chỉ ip này bằng proxy thì sử dụng code sau : Code: 01 function getRealIPAddr() 02 { 03 if (!empty($_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 $ip; 17 } 4. Seconds to String Code: 01 function secsToStr($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 Code: 01 //this is a sample xml string 02 $xml_string="<?xml version='1.0'?> 03 <moleculedb> 04 <molecule name='Benzine'> 05 <symbol>ben</symbol> 06 <code>A</code> 07 </molecule> 08 <molecule name='Water'> 09 <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 $record->code, '<br />'; 25 } 7. Database Connection in PHP Code: 01 if(basename(__FILE__) == basename($_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", $db) 10 or die ("Couldn't select the database."); 11 12 # This function will send an imitation 404 page if the user 13 # types in this files filename into the address bar. 14 # only files connecting with in the same directory as this 15 # file will be able to use it as well. 16 function send_404() 17 { 18 header('HTTP/1.x 404 Not Found'); 19 print '<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">'."n". 20 '<html><head>'."n". 21 '<title>404 Not Found</title>'."n". 22 '</head><body>'."n". 23 '<h1>Not Found</h1>'."n". 24 '<p>The requested URL '. 25 26 str_replace(strstr($_SERVER['REQUEST_URI'], '?'), 27 '', $_SERVER['REQUEST_URI']). 28 ' was not found on this server.</p>'."n". 29 '</body></html>'."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 Code: 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"]} ‘; Code: 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 Code: 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 Code: 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 $str; 18 19 # If you have a database you can save the string in 20 21 # there, and send the user an email with the code in 22 23 # it they then can click a link or copy the code 24 25 # and you can then verify that that is the correct email 26 27 # or verify what ever you want to verify 11. Date format validation in PHP Code: 01 function checkDateFormat($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 Code: 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 != " " && $file != "Thumbs.db") 11 { 12 echo '<a target="_blank" href="'.$dir.$file.'"> 13 '.$file.'</a><br>'.""; 14 } 15 } 16 closedir($handle); 17 } 18 } 19 } 20 /* 21 To use: 22 23 <?php 24 25 list_files("images/"); 26 27 ?> 28 29 */ 14. Browser Detection script in PHP Code: 1 $useragent = $_SERVER ['HTTP_USER_AGENT']; 2 echo "<b>Your User Agent is</b>: " . $useragent; 15. Unzip a Zip File Code: 01 function unzip($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: Code: 1 include 'functions.php'; 2 if(unzip('zipedfiles/test.zip','unziped/myNewZip')) 3 echo 'Success!'; 4 else 5 echo 'Error'; __________________ . we will name this file db .php 35 # just add this line of php code (without the pound sign): 36 # include"db .php& quot;; 8. Creating and Parsing JSON data in PHP Code: 1 $json_data = array. false; 12 } 13 else 14 return false; 15 } 12. HTTP Redirection in PHP Trích: 1 header('Location: 'http://you_stuff/url .php& apos;); 13. Directory Listing in PHP Code: 01 function list_files($dir) 02. <symbol>ben</symbol> 06 < ;code& gt;A< /code& gt; 07 </molecule> 08 <molecule name='Water'> 09 <symbol>h2o</symbol> 10 < ;code& gt;K< /code& gt; 11 </molecule> 12