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cloud engineer

PHP 7.0 to 7.4 Upgrade

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

List Available PHP Modules

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

Run Shell Script From Your Website

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

Phpinfo Blank Page

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

WordPress Numeric Pagination

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.