DEDECSM Weaving dream incompatible php7, weaving dream Dede not supported under php7.0,php7.1,php7.2 use

Although the son Heng teacher in the previous article,
To solve some of the errors in the PHP7 environment, DEDECMS
PHP7 Dream Background Login page blank
Dedecms Article management page blank
I dream Dede foreground article content cannot be displayed, {dede:field.body/} label is invalid

But later PHP7 used Dedecms and encountered a lot of pits.

It is strongly recommended that you give up your dream dedecms system in PHP7,
Otherwise there will be a lot of inexplicable trouble waiting for you,
Even if you upgrade to the latest DEDECMS-V5.7-UTF8-SP2 version,
Dream Dedecms is only suitable for use in php5.6~ versions.

If your system has been upgraded to PHP7,
You can install a php5 in the system,
At the same time running PHP7, PHP5,
Then configure Nginx,
The link to the Dream dedecms,
Forwarding to PHP5 parsing,

Specifically, you can learn from this article,
bash here,

Learn how to run PHP5 and PHP7 at the same time on Linux systems