cloud engineer
Here’s how to install a LAMP server on the latest Ubuntu 20.04 LTS.
Install Apache.
apt install apache2
systemctl status apache2
systemctl is-enabled apache2 |
Install MariaDB.
apt install mariadb-server mariadb-client
systemctl status mariadb
systemctl is-enabled mariadb
mysql_secure_installation |
Install PHP.
apt install php libapache2-mod-php php-mysql
systemctl restart apache2 |
Enable ssl and mod_rewrite.
a2enmod ssl a2enmod rewrite systemctl restart apache2 |
Here are steps I took to upgrade from PHP 7.0 to 7.4 on Ubuntu 18.04 LTS.
Login as root, otherwise use sudo for all commands.
# use 3rd party ppa repo add-apt-repository ppa:ondrej/php apt -y update apt -y upgrade # install php-core apt install php7.4 php7.4-common php7.4-cli # add all the php extenstions your app needs apt install php7.4-curl php7.4-json php7.4-gd php7.4-mbstring apt install php7.4-intl php7.4-bcmath php7.4-bz2 php7.4-xml apt install php7.4-readline php7.4-zip php7.4-mysql # I'm using apache prefork MPM, so install it apt install libapache2-mod-php7.4 a2enmod php7.4 # check version. Success! php -v # for good measure, reboot apache systemctl restart apache2.service # Finally, purge the old PHP versions apt purge php7.0 libapache2-mod-php7.0 |
Finally, run update on more time to get all the latest updates.
apt -y update apt -y upgrade apt -y autoremove apt-get --with-new-pkgs upgrade |
Here’s how to list the available PHP modules.
apt-cache search php- | less |
To get details about a module.
apt-cache show php-curl |
To install a module.
apt install php-curl |
Or install all modules.
apt install php* |
Restart Apache after each install.
systemctl restart apache2 |
Here’s how to run a shell script from your website. You’ll need 2 files.
Here’s the contents of foo.php. Wrap your output with ‘pre’ for better formatting.
<?php $output = shell_exec('/var/www/html/bar.sh 2>&1'); echo "$output"; |
Here’s the content of bar.sh. Output will be displayed on web page.
#!/bin/bash now="$(date +'%y%m%d')" echo $now aws s3 ls |
Here’s how to fix when phpinfo is displaying a blank page. The install is missing this php module.
apt install php libapache2-mod-php |
Restart after install.
service apache2 restart |
Here’s how to add numeric pagination on your WordPress pages.
Add this code to functions.php.
function pagination($pages = '', $range = 4) { $showitems = ($range * 2)+1; global $paged; if(empty($paged)) $paged = 1; if($pages == '') { global $wp_query; $pages = $wp_query->max_num_pages; if(!$pages) { $pages = 1; } } if(1 != $pages) { echo '<p><div class="pagination"><span>Page' . $paged . ' of ' . $pages . '</span> '; if($paged > 2 && $paged > $range+1 && $showitems < $pages) echo '<a href="' . get_pagenum_link(1) . '"><< First</a>'; if($paged > 1 && $showitems < $pages) echo '<a href="'.get_pagenum_link($paged - 1).'">< Previous</a>'; for ($i=1; $i <= $pages; $i++) { if (1 != $pages &&( !($i >= $paged+$range+1 || $i <= $paged-$range-1) || $pages <= $showitems )) { echo ($paged == $i)? '<span class="current">' . $i . '</span>' : '<a href="' . get_pagenum_link($i) . '"class="inactive">' . $i . '</a>'; } } if ($paged < $pages && $showitems < $pages) echo '<a href="' . get_pagenum_link($paged + 1) . '">Next ></a>'; if ($paged < $pages-1 && $paged+$range-1 < $pages && $showitems < $pages) echo '<a href="' . get_pagenum_link($pages) . '">Last >></a>'; echo '</div></p>'; } } |
To display, comment out ‘the_post_navigation’ function and add the ‘pagination’ function instead in your template files.
//the_posts_navigation(); pagination(); |
Code courtesy of webdesignsun.
If you switched to HTTPS in Apache, make sure to update CodeIgniter’s config file.
vim /var/www/applications/config/config.php |
Change the base URL to https.
$config['base_url'] = 'https://yourdomain.com/ci/'; |
If you would like to launch a new career as a front-end developer, which programming language would you choose? You have multiple options, but nothing could be as popular as PHP and Node.js. An article from ComputerWorld examines the strengths and weaknesses of both languages. Each language has their own pluses and minuses. PHP is simpler, with a deeper code base, easy access to databases, and it’s boosted by HHVM and the Hack language. Node.js is based on Javascript with thinner service calls. It works with JSON, and raw speed is unparalleled. Both languages has it’s own MVC frameworks. Perhaps, a hybrid solution of PHP and Node.js might be the best approach on some projects. It really depends on what you’re trying to achieve. If you want to code fast, you may choose PHP. If application raw speed is in order, then you may want to consider using Node.js.
Today, I would like to share with you how to create a WordPress countdown plugin of a future date and time. The plugin output displays the number of days, hours, minutes and seconds left. The plugin uses a WordPress shortcode that you can insert inside your post. A Shortcode makes it easier to display results in WordPress.
Output: [counting_down_the_days]
Here’s the plugin code:
/* Plugin Name: Counting Down the Days Plugin URI: http://uly.me Description: php countdown Version: 1.0 Author: Ulysses Ronquillo Author URI: http://uly.me */ // place your php code here function urr_countdown_days() { date_default_timezone_set('Americas/New_York'); $date = strtotime("January 27, 2017 7:15 PM"); $remaining = $date - time(); $days_remaining = floor($remaining / 86400); $hours_remaining = floor(($remaining % 86400) / 3600); $minutes_remaining = floor(($remaining-($days_remaining*60*60*24)-($hours_remaining*60*60))/60); $seconds_remaining = floor(($remaining-($days_remaining*60*60*24)-($hours_remaining*60*60))-($minutes_remaining*60)); return 'There are '.$days_remaining.' days and '.$hours_remaining.' hours and '.$minutes_remaining.' minutes and '.$seconds_remaining.' seconds left.'; } add_shortcode('counting_down_the_days','urr_countdown_days'); |
The PHP date function is used to calculate the days, hours, minutes and seconds remaining and returns the output. The script is one of many PHP examples online on how to perform countdowns. This was one of the more popular ones. The script also uses the PHP floor function to get the lowest integer while ignoring the leftover fraction or remainder. To use the plugin, place the shortcode ‘counting_down_the_days’ (wrap it in square brackets) anywhere inside your WordPress post.
Output: [counting_down_the_days]
If you set a date in the past, the output will say, “Set a future date!”
This article will show you how to install PHP on the Mac. By default, Apache and PHP are already installed on the Mac, although both are not activated. We must first enable Apache. Once you’ve Apache is enabled, you can then proceed in activating PHP.
This article is part of a series of articles on how to manually install Apache, PHP, MySQL on the Mac OS. Installing the popular MAMP application is as simple as installing any other application on the Mac, but it will not give you any valuable learning experience, nor will you have complete control of your development environment. I recommend manually installing the individual applications to maximize your learning experience.
PHP is already installed. We just have to enable it. Edit the ‘/etc/apache2/httpd.conf‘ file.
$ sudo nano /etc/apache2/httpd.conf |
Uncomment or delete the ‘#’ sign for the line that contains the text below.
LoadModule php5_module libexec/apache2/libphp5.so |
Restart Apache
$ sudo apachectl restart |
Place a index.php file that contains the following in your web server root.
<?php phpinfo(); ?> |
If you see PHP info and stats, that means PHP is working! If you see the code, it means PHP is not working.