Easy SMTP email settings for WordPress

wp-mail-function

If you are facing problems with wp_mail function in sending emails, the solution is to use an SMTP server rather than relying on the webserver.

WordPress’s email function wp_mail is essentially a wrapper for phpmailer, a popular email class for PHP. WordPress has a little known action hook when phpmailer is initialized, phpmailer_init. This allows you to establish the phpmailer instance as using SMTP.

Here is a code snippet example with comments for each setting to configure WordPress to sent SMTP email:

/**
 * This function will connect wp_mail to your authenticated
 * SMTP server. This improves reliability of wp_mail, and 
 * avoids many potential problems.
 */
 
add_action( 'phpmailer_init', 'send_smtp_email' );

function send_smtp_email( $phpmailer ) {

	// Define that we are sending with SMTP
	$phpmailer->isSMTP();

	// The hostname of the mail server
	$phpmailer->Host = "smtp.example.com";

	// Use SMTP authentication (true|false)
	$phpmailer->SMTPAuth = true;

	// SMTP port number - likely to be 25, 465 or 587
	$phpmailer->Port = "587";

	// Username to use for SMTP authentication
	$phpmailer->Username = "yourusername";

	// Password to use for SMTP authentication
	$phpmailer->Password = "yourpassword";

	// Encryption system to use - ssl or tls
	$phpmailer->SMTPSecure = "tls";

	$phpmailer->From = "you@yourdomail.com";
	$phpmailer->FromName = "Your Name";
}

To use this snippet, you will need to adjust the settings according to your email service requirements. Check with your host.

The snippet, once configured, can be added to your theme’s functions.php file.

How to send email using PHPMailer

phpmailer

First, download PHPMailer using the direct link below:

PHPMailer_5.2.0.zip

After you have downloaded the file, unzip and extract it to your public_html. After unzipping the file we have public_html/PHPMailer_5.2.0. Next you will need to edit your web pages to use the PHPMailer code.

Add the PHPMailer code to your site:

<?php
require("class.PHPMailer.php");

$mail = new PHPMailer();

$mail->IsSMTP(); // set mailer to use SMTP
$mail->Host = "mail.hostname.com"; // specify main and backup server
$mail->SMTPAuth = true; // turn on SMTP authentication
$mail->Username = "USERNAME"; // SMTP username
$mail->Password = "PASSWORD"; // SMTP password

$mail->From = "from@example.com";
$mail->FromName = "Mailer";
$mail->AddAddress("josh@example.net", "Josh Adams");
$mail->AddAddress("ellen@example.com"); // name is optional
$mail->AddReplyTo("info@example.com", "Information");

$mail->WordWrap = 50; // set word wrap to 50 characters
$mail->AddAttachment("/var/tmp/file.tar.gz"); // add attachments
$mail->AddAttachment("/tmp/image.jpg", "new.jpg"); // optional name
$mail->IsHTML(true); // set email format to HTML

$mail->Subject = "Here is the subject";
$mail->Body = "This is the HTML message body <b>in bold!</b>";
$mail->AltBody = "This is the body in plain text for non-HTML mail clients";

if(!$mail->Send())
{
echo "Message could not be sent. <p>";
echo "Mailer Error: " . $mail->ErrorInfo;
exit;
}

echo "Message has been sent";
?>

That’s it.

Transfer files from one server to another server using PHP

 

server-to-server-php

Sometimes you need to move/migrate files to another server/hosting, and you/your client only have FTP access to the server. And to download these files and re-upload to another server can take a lot of time using FTP client such as Filezilla. FTP do not have zip – unzip functionality, so you need to upload it one by one. And server to server transfer is a lot faster than downloading and uploading the files.

You can use this simple PHP script to move files from one server to another server.

Note: It’s just a simple examples. you need to build your own auth/security method if needed.

1. Using PHP Copy to move files from server to server.

You can just create a php file in the destination server and load the file once in your browser. For example you add this code in http://destination-url/copy-files.php and in copy-files.php you add this php code:

  1. /**
  2.  * Transfer Files Server to Server using PHP Copy
  3.  * 
  4.  */
  5.  
  6. /* Source File URL */
  7. $remote_file_url = “http://origin-server-url/files.zip&#8221;;
  8.  
  9. /* New file name and path for this file */
  10. $local_file = ‘files.zip’;
  11.  
  12. /* Copy the file from source url to server */
  13. $copy = copy( $remote_file_url, $local_file );
  14.  
  15. /* Add notice for success/failure */
  16. if( !$copy ) {
  17.     echo “Doh! failed to copy $file…\n”;
  18. }
  19. else{
  20.     echo “WOOT! success to copy $file…\n”;
  21. }

2. Using PHP FTP to move files from server to server

Sometimes using PHP Copy didn’t work if the files is somehow protected by this method (hotlink protection maybe?). I did experience that if the source is from Hostgator it didn’t work.

But we can use another method. Using FTP (in PHP) to do the transfer using the code:

  1. /**
  2.  * Transfer (Import) Files Server to Server using PHP FTP
  3.  * 
  4.  */
  5.  
  6. /* Source File Name and Path */
  7. $remote_file = ‘files.zip’;
  8.  
  9. /* FTP Account */
  10. $ftp_host = ‘your-ftp-host.com’; /* host */
  11. $ftp_user_name = ‘ftp-username@your-ftp-host.com’; /* username */
  12. $ftp_user_pass = ‘ftppassword’; /* password */
  13.  
  14.  
  15. /* New file name and path for this file */
  16. $local_file = ‘files.zip’;
  17.  
  18. /* Connect using basic FTP */
  19. $connect_it = ftp_connect( $ftp_host );
  20.  
  21. /* Login to FTP */
  22. $login_result = ftp_login( $connect_it, $ftp_user_name, $ftp_user_pass );
  23.  
  24. /* Download $remote_file and save to $local_file */
  25. if ( ftp_get( $connect_it, $local_file, $remote_file, FTP_BINARY ) ) {
  26.     echo “WOOT! Successfully written to $local_file\n”;
  27. }
  28. else {
  29.     echo “Doh! There was a problem\n”;
  30. }
  31.  
  32. /* Close the connection */
  33. ftp_close( $connect_it );

using FTP you have more flexibility, the code above is using ftp_get to import the files from source server to destination server. But we can also use ftp_put to export the files (send the files) from source server to destination, using this code:

  1. /**
  2.  * Transfer (Export) Files Server to Server using PHP FTP
  3.  * 
  4.  */
  5.  
  6. /* Remote File Name and Path */
  7. $remote_file = ‘files.zip’;
  8.  
  9. /* FTP Account (Remote Server) */
  10. $ftp_host = ‘your-ftp-host.com’; /* host */
  11. $ftp_user_name = ‘ftp-username@your-ftp-host.com’; /* username */
  12. $ftp_user_pass = ‘ftppassword’; /* password */
  13.  
  14.  
  15. /* File and path to send to remote FTP server */
  16. $local_file = ‘files.zip’;
  17.  
  18. /* Connect using basic FTP */
  19. $connect_it = ftp_connect( $ftp_host );
  20.  
  21. /* Login to FTP */
  22. $login_result = ftp_login( $connect_it, $ftp_user_name, $ftp_user_pass );
  23.  
  24. /* Send $local_file to FTP */
  25. if ( ftp_put( $connect_it, $remote_file, $local_file, FTP_BINARY ) ) {
  26.     echo “WOOT! Successfully transfer $local_file\n”;
  27. }
  28. else {
  29.     echo “Doh! There was a problem\n”;
  30. }
  31.  
  32. /* Close the connection */
  33. ftp_close( $connect_it );

To make it easier to understand:

  • ftp_connect is to connect via FTP.
  • ftp_login is to login to FTP account after connection established.
  • ftp_close is to close the connection after transfer done (log out).
  • ftp_get is to import/download/pull file via FTP.
  • ftp_put is to export/send/push file via FTP.

After you import/export the file, always delete the PHP file you use to do this task to prevent other people using it.

ZIP and UNZIP Files using PHP

Of course to make the transfer easier we need to zip the files before moving, and unzip it after we move to destination.

ZIP Files using PHP

You can zip all files in the folder using this code:

  1. /**
  2.  * ZIP All content of current folder
  3.  * 
  4.  */
  5.  
  6. /* ZIP File name and path */
  7. $zip_file = ‘files.zip’;
  8.  
  9. /* Exclude Files */
  10. $exclude_files = array();
  11. $exclude_files[] = realpath( $zip_file );
  12. $exclude_files[] = realpath( ‘zip.php’ );
  13.  
  14. /* Path of current folder, need empty or null param for current folder */
  15. $root_path = realpath( );
  16.  
  17. /* Initialize archive object */
  18. $zip = new ZipArchive;
  19. $zip_open = $zip->open( $zip_file, ZipArchive::CREATE );
  20.  
  21. /* Create recursive files list */
  22. $files = new RecursiveIteratorIterator(
  23.     new RecursiveDirectoryIterator( $root_path ),
  24.     RecursiveIteratorIterator::LEAVES_ONLY
  25. );
  26.  
  27. /* For each files, get each path and add it in zip */
  28. if( !empty( $files ) ){
  29.  
  30.     foreach( $files as $name => $file ) {
  31.  
  32.         /* get path of the file */
  33.         $file_path = $file->getRealPath();
  34.  
  35.         /* only if it’s a file and not directory, and not excluded. */
  36.         if( !is_dir( $file_path ) && !in_array( $file_path, $exclude_files ) ){
  37.  
  38.             /* get relative path */
  39.             $file_relative_path = str_replace( $root_path, , $file_path );
  40.  
  41.             /* Add file to zip archive */
  42.             $zip_addfile = $zip->addFile( $file_path, $file_relative_path );
  43.         }
  44.     }
  45. }
  46.  
  47. /* Create ZIP after closing the object. */
  48. $zip_close = $zip->close();

UNZIP Files using PHP

You can unzip file to the same folder using this code:

  1. /**
  2.  * Unzip File in the same directory.
  3.  * @link http://stackoverflow.com/questions/8889025/unzip-a-file-with-php
  4.  */
  5. $file = ‘file.zip’;
  6.  
  7. $path = pathinfo( realpath( $file ), PATHINFO_DIRNAME );
  8.  
  9. $zip = new ZipArchive;
  10. $res = $zip->open($file);
  11. if ($res === TRUE) {
  12.     $zip->extractTo( $path );
  13.     $zip->close();
  14.     echo “WOOT! $file extracted to $path”;
  15. }
  16. else {
  17.     echo “Doh! I couldn’t open $file”;
  18. }

Other Alternative to ZIP / UNZIP File

Actually, if using cPanel you can easily create zip and unzip files using cPanel File Manager.

cpanel-zip-unzip-file-manager

I hope this tutorial is useful for you who need a simple way to transfer files from server to server.

PHP code to check if a string is valid JSON or not

json_logo-555px__1_

A function to check if a string is valid JSON (JavaScript Object Notation) or not. It takes json string as a parameter and returns true if valid, otherwise false.


function isValidJson($string){
$json = json_decode($string);
return (is_object($json) && json_last_error() == JSON_ERROR_NONE) ? true : false;
}

#How to use
if(isValidJson('{"a":1}')){
echo "Valid Json";
}else{
echo 'Invalid Json' ;
}