Invoking wp i18n make-pot fails when Xdebug is enabled

[westonruter]

In VVV after having done xdebug_on and run:

wp i18n make-pot . languages/amp-js.pot --include="*.js"

I get an error:

PHP Fatal error:  Maximum function nesting level of '100' reached, aborting! in phar:///usr/local/bin/wp/vendor/mck89/peast/lib/Peast/Syntax/Scanner.php on line 972

If I do xdebug_off then it succeeds.

The plugin context here is AMP.

[schlessera]

@westonruter This is a limitation to recursion that xdebug sets into place, regular PHP without an extension doesn't have such a limit.

This limit is normally set to 256. In your case it is 100, because you are using an older version of xdebug as well (< 2.3).

You can set this limit manually using the xdebug.max_nesting_level setting.

I don't see how we could get around this from within WP-CLI, but we might want to add this to our list of common issues.

[brenoalvs]

@westonruter @schlessera I was working with Docker locally so I had to change two settings to be able to run the command within my container. But the command works fine if I run it directly from my machine.

memory_limit = 512M
xdebug.max_nesting_level = 512

The settings values may be a little exorbitant, but I think they're safe for development environments.
I hope it helps someone.

[EvanHerman]

Running this on CircleCI also throws the Maximum function nesting level error.

The following will disable xdebug in a CircleCI job:

- run:
    name: Disable xdebug PHP extension
    command: sudo rm /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini

[matzeeable]

I just stumbled over this thread and solved it in that way:

$ php -n -dextension=phar.so -dextension=json.so -dextension=mbstring.so $(which wp) i18n make-pot [...]

I use php bin to execute wp bin so I can pass additional parameters like -n which disables all extension (see this). With dextension I can enable all extensions needed for i18n make-pot.

This also brings a huge performance improvement, here a benchmark of my WSL Ubuntu machine:

With the previous mentioned solution of @schlessera and @brenoalvs it takes about 41.42s:

$ php -d xdebug.max_nesting_level=512 $(which wp) i18n make-pot [...]
Success: POT file successfully generated!
Done in 41.42s.

And with all extensions disabled expect required ones it takes 4.42s!!

$ php -n -dextension=phar.so -dextension=json.so -dextension=mbstring.so $(which wp) i18n make-pot [...]
Success: POT file successfully generated!
Done in 4.42s.