Is XF 1.5 compatible with PHP 7.3?

The biggest unknown at this point would be that they have moved from the legacy PCRE to PCRE2.

We haven't tested it, yet, and may not do until it is stable. Of course, there's no guarantee that any fixes required would be made in XF 1.5 though we would certainly be aiming to make 2.0 compliant at the very least.
 
There seem to be a few issues related to control structures, but nothing dramatic.

phpcs -p /xenforo1.5.22 --standard=PHPCompatibility --extensions=php

Code:
FILE: /xenforo1.5.22/library/XenForo/Importer/SMF.php
-----------------------------------------------------------------------------------------------------------------------------------------------------
FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
-----------------------------------------------------------------------------------------------------------------------------------------------------
1075 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
-----------------------------------------------------------------------------------------------------------------------------------------------------

FILE: /xenforo1.5.22/library/XenForo/Importer/vBulletin.php
----------------------------------------------------------------------------------------------------------------------------------------------------
FOUND 0 ERRORS AND 4 WARNINGS AFFECTING 4 LINES
----------------------------------------------------------------------------------------------------------------------------------------------------
341 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
345 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
585 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
594 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
----------------------------------------------------------------------------------------------------------------------------------------------------

FILE: /xenforo1.5.22/library/XenForo/Importer/IPBoard40x.php
----------------------------------------------------------------------------------------------------------------------------------------------------
FOUND 0 ERRORS AND 3 WARNINGS AFFECTING 3 LINES
----------------------------------------------------------------------------------------------------------------------------------------------------
147 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
151 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
606 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
----------------------------------------------------------------------------------------------------------------------------------------------------

FILE: /xenforo1.5.22/library/XenForo/Importer/IPBoard.php
-----------------------------------------------------------------------------------------------------------------------------------------------------
FOUND 0 ERRORS AND 3 WARNINGS AFFECTING 3 LINES
-----------------------------------------------------------------------------------------------------------------------------------------------------
 334 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
 343 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
1071 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
-----------------------------------------------------------------------------------------------------------------------------------------------------

FILE: /xenforo1.5.22/library/XenForo/Importer/PhpBb3.php
----------------------------------------------------------------------------------------------------------------------------------------------------
FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
----------------------------------------------------------------------------------------------------------------------------------------------------
234 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
528 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
----------------------------------------------------------------------------------------------------------------------------------------------------

FILE: /xenforo1.5.22/library/XenForo/Locale.php
----------------------------------------------------------------------------------------------------------------------------------------------------
FOUND 0 ERRORS AND 21 WARNINGS AFFECTING 21 LINES
----------------------------------------------------------------------------------------------------------------------------------------------------
201 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
202 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
205 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
206 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
209 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
212 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
213 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
214 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
215 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
218 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
219 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
222 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
223 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
226 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
227 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
228 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
229 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
232 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
235 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
238 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
246 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
----------------------------------------------------------------------------------------------------------------------------------------------------

FILE: /xenforo1.5.22/library/Zend/Pdf/FileParser/Font/OpenType.php
----------------------------------------------------------------------------------------------------------------------------------------------------
FOUND 0 ERRORS AND 3 WARNINGS AFFECTING 3 LINES
----------------------------------------------------------------------------------------------------------------------------------------------------
889 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
908 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
920 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
----------------------------------------------------------------------------------------------------------------------------------------------------

FILE: /xenforo1.5.22/library/Zend/Feed/Entry/Atom.php
----------------------------------------------------------------------------------------------------------------------------------------------------
FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
----------------------------------------------------------------------------------------------------------------------------------------------------
106 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
----------------------------------------------------------------------------------------------------------------------------------------------------

FILE: /xenforo1.5.22/library/Zend/Reflection/File.php
----------------------------------------------------------------------------------------------------------------------------------------------------
FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
----------------------------------------------------------------------------------------------------------------------------------------------------
349 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
357 | WARNING | Targeting a 'switch' control structure with a 'continue' statement is strongly discouraged and will throw a warning as of PHP 7.3.
----------------------------------------------------------------------------------------------------------------------------------------------------

This scan was done against XenForo 1.5.22
 
The biggest unknown at this point would be that they have moved from the legacy PCRE to PCRE2.

We haven't tested it, yet, and may not do until it is stable. Of course, there's no guarantee that any fixes required would be made in XF 1.5 though we would certainly be aiming to make 2.0 compliant at the very least.
Hoping test starts soon. FYI, PHP 7.3.0 GA Stable is coming out today - very speedy version from my benchmarks https://community.centminmod.com/threads/php-7-3-vs-7-2-vs-7-1-vs-7-0-php-fpm-benchmarks.16090/ :)
 
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