Vscode-intelephense: Undefined function in PHP core functions

[mmcarvalho]

VSCode automatically updated intelephense from 1.3.0 to 1.3.1 and start mark a lot of function calls from WordPress and PHP native calls as _Undefined function_.

bmewburn suggestion looks like a temporary fix but I do wish it to keep highlighting what is undefined.

How to fix this?

[KapitanOczywisty]

For first screenshot https://github.com/bmewburn/vscode-intelephense/issues/787#issuecomment-561342711

Second is a weird one, and I can't reproduce it. It looks like intelephense.stubs setting don't have Core nor standard. Can you check this setting?
Can you also check if \function_exists will work?

[mmcarvalho]

For first screenshot #787 (comment)

Thanks, this is very usefull.

Second is a weird one, and I can't reproduce it. It looks like intelephense.stubs setting don't have Core nor standard. Can you check this setting?
Can you also check if \function_exists will work?

The settings for excluding files were incorrect and were causing the problem.
There was something like this :

"intelephense.files.exclude": {
"vendor": true,
"build": true,
"packages": true,
"node_modules": true,
"wp-includes": true,
"wp-admin": true
}

And it should be:
"intelephense.files.exclude": [
"**/vendor/**",
"**/build/**",
"**/packages/**",
"**/node_modules/**",
"**/wp-includes/**",
"**/wp-admin/**"
],

Combining the you're first suggestion with this change fixs it.

[ahmadawais]

I solved it by installing composer require --dev giacocorsiglia/wordpress-stubs and setting "intelephense.files.maxSize": 3200000, in the VSCode editor.

[StanislavNemytov]

Also you can try open full project in you code editor, not only theme folder.

[IlanVivanco]

If you're using WSL (tested on V2 at least), you need to add the composer global path to the include paths like so on settings.json

"intelephense.environment.includePaths": [
     "/home/ilan/.composer/vendor/",
  ],

Then I required the WordPress and ACF stubs, like @ahmadawais said, but globally:

composer require global giacocorsiglia/wordpress-stubs paulthewalton/acf-stubs paulthewalton/acf-pro-stubs

This is probably useful on #907 and #892 as well.