[SAC] [OSGeo] #2069: Upgrade Staging to Php7

[OSGeo]

#2069: Upgrade Staging to Php7
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 Reporter:  wildintellect  |      Owner:  sac@…
     Type:  task           |     Status:  new
 Priority:  normal         |  Milestone:
Component:  Systems Admin  |   Keywords:
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 I hadn't noticed this until #2057. We should not be deploying new sites on
 php5. For long term security maintenance we ought to move to php7.

 Clearly this got missed as we didn't closely review the work on the
 contract early on. In order to make this switch we'll need to review if
 any of the plugins in use would be broken.

 Trying it out as noted here might be the fastest way.
 https://themeisle.com/blog/upgrade-wordpress-to-php-7/

 Knowing how to do this procedure should make some of the other open items
 easier too.

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2069>
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