Upgrade from PHP5 to PHP7.0 (Debian 8 Jessie, Apache2, mySQL & WordPress 4.4.2)

Upgrade from PHP5 to PHP7.0 on Debian 8 Jessie with Apache2 and mySQL (for WordPress)

Generic notes on a recent upgrade I made on a WordPress installation that's running on a Google Compute Engine virtual machine.

This also assumes use of:
WordPress Enfold Theme
WordPress myCred Plugin

Install PHP7 & dependencies: ssh user@domain.com Upgrade from PHP5 to PHP7.0 on Debian 8 Jessie with Apache2 and mySQL (for WordPress)

Install and Config sudo nano /etc/apt/sources.list deb http://packages.dotdeb.org jessie all deb-src http://packages.dotdeb.org jessie all wget https://www.dotdeb.org/dotdeb.gpg sudo apt-key add dotdeb.gpg sudo apt-get update sudo apt-get install php7.0 libapache2-mod-php7.0 php7.0-cgi php7.0-fpm php7.0-mysql php-mysql mcrypt php7.0-mcrypt -y Personal Tweaks: sudo nano /etc/php/7.0/apache2/php.ini post_max_size = 100M upload_max_filesize = 100M memory_limit = 256M Enable PHP7.0 Apache2 Module sudo a2dismod php5 sudo a2enmod php7.0 sudo service apache2 restart sudo service mysql restart Check version of PHP: sudo nano /var/www/html/info.php <?php phpinfo()?> http://domain.com/info.php Don't leave your info file hangin' around now sudo rm /var/www/html/info.php php -v

Enable Debugging & Watch Debug Log: ssh user@domain.com

sudo nano /var/www/html/wp-config.php define( 'WP_DEBUG', true ); define( 'WP_DEBUG_LOG', true ); define( 'WP_DEBUG_DISPLAY', false ); @ini_set( 'display_errors', 0 ); tail -f /var/www/html/wp-content/debug.log

FIX PHP Fatal ERRORS:  Uncaught Error: Function name must be a string
1	sudo nano /var/www/html/wp-content/themes/enfold/framework/php/class-htmlhelper.php // $output .= $this->$element['type']( $element ); LINE 203 AND LINE 222 OR 223 $output .= $this->{$element['type']}( $element );	ENFOLD
2	sudo nano /var/www/html/wp-content/themes/enfold/framework/php/class-style-generator.php // $this->output .= $this->$rule['key']($rule)."\n"; $this->output .= $this->{$rule['key']}($rule)."\n";	ENFOLD
3	sudo nano /var/www/html/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/html-helper.class.php // $output .= self::$element['type']($element, $parent_class); LINE 130 AND LINE 146 OR 147 $output .= self::{$element['type']}($element, $parent_class); // $output .= self::$element['data']['save_to']($element); $output .= self::{$element['data']['save_to']}($element);	ENFOLD
4	sudo nano /var/www/html/wp-content/themes/enfold/framework/php/class-form-generator.php // $this->$element['type']($element_id.$this->id_sufix, $element); $this->{$element['type']}($element_id.$this->id_sufix, $element);	ENFOLD
5	sudo nano /var/www/html/wp-content/plugins/mycred/addons/stats/myCRED-addon-stats.php // $this->$method[1]( $current ); $this->{$method[1]}( $current );	MYCRED

	FIX Deprecated Constructor WARNINGS
6	sudo nano /var/www/html/wp-content/themes/enfold/config-layerslider/LayerSlider/wp/widgets.php //      function LayerSlider_Widget() {        function __construct() {	ENFOLD > LayerSlider_Widget
7	sudo nano /var/www/html/wp-content/themes/enfold/includes/helper-responsive-megamenu.php //              function avia_responsive_mega_menu($options = array())                function __construct($options = array())	ENFOLD > avia_responsive_mega_menu
8	sudo nano /var/www/html/wp-content/themes/enfold/framework/php/class-superobject.php //              public function avia_superobject( $base_data )                public function __construct ( $base_data)	ENFOLD > avia_superobject
9	sudo nano /var/www/html/wp-content/themes/enfold/framework/php/wordpress-importer/avia-export-class.php //              function avia_wp_export($avia_superobject)                function __construct($avia_superobject)	ENFOLD > avia_wp_export
10	sudo nano /var/www/html/wp-content/themes/enfold/framework/php/class-database-option-sets.php //              function avia_database_set($avia_superobject = false)                function __construct($avia_superobject = false)	ENFOLD > avia_database_set
11	sudo nano /var/www/html/wp-content/themes/enfold/framework/php/class-htmlhelper.php //              function avia_htmlhelper($avia_superobject = false)                function __construct($avia_superobject = false)	ENFOLD > avia_htmlhelper
12	sudo nano /var/www/html/wp-content/themes/enfold/framework/php/class-metabox.php //              function avia_meta_box($avia_superobject)                function __construct($avia_superobject)	ENFOLD > avia_meta_box
13	sudo nano /var/www/html/wp-content/themes/enfold/framework/php/class-adminpages.php //              function avia_adminpages(&$avia_superobject)                function __construct(&$avia_superobject)	ENFOLD > avia_adminpages
14	sudo nano /var/www/html/wp-content/themes/enfold/framework/php/class-breadcrumb.php //      function avia_breadcrumb($options = ""){        function __construct($options = ""){	ENFOLD > avia_breadcrumb
15	sudo nano /var/www/html/wp-content/themes/enfold/framework/php/class-form-generator.php //              function avia_form($params)                function __construct($params)	ENFOLD > avia_form
16	sudo nano /var/www/html/wp-content/themes/enfold/framework/php/avia_shortcodes/shortcodes.php //      function avia_shortcodes() {        function __construct() {	ENFOLD > avia_shortcodes
17	sudo nano /var/www/html/wp-content/themes/enfold/framework/php/class-megamenu.php //              function avia_megamenu()                function __construct()	ENFOLD > avia_megamenu