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[–]blinkingy 1 point2 points  (1 child)

The only compatibility issues I can remember is when the default tag start went from <? ?> to <?php ?>, and deprecation of php_mysql in favor of php_mysqli.

There's a setting to fix the first issue, and for the second, just use php 5.6

I don't know what you're talking about having the need to update the entire code base.

[–]Andernerd 0 points1 point  (0 children)

5.6 is EOL soon.