PHP

devid php list                 # installed versions and whether php-fpm runs
devid php install 8.4          # add another version
devid php use 8.4              # make it the default
devid php ext 8.5 xdebug on    # turn Xdebug (or pcov) on/off for a version
devid php ext list 8.4         # bundled, Xdebug/pcov, and installed catalog extensions

The php command follows the folder you are in. Inside an isolated site it uses that site's version; anywhere else it uses the default. composer works the same way.
Extensions:
- Every version includes:
  - bcmath, ctype, curl, dom, exif, fileinfo, gd, iconv, intl, mbstring, opcache, openssl, pcntl;
  - PDO with MySQL, PostgreSQL and SQLite, plus mysqli, pgsql and sqlite3;
  - readline (for php -a and artisan tinker), redis, soap, sockets, sodium, zip, and the XML extensions.
- Xdebug and pcov are included but off by default. Xdebug starts in trigger mode on port 9003.
Extra extensions: see PHP extensions.
php.ini: each version has ~/.devid/php/<version>/etc/php.ini. Devid writes it once and never overwrites it. After editing it, run devid restart php-8.5. The defaults are memory_limit = 512M, uploads up to 64 MB, errors displayed, and JIT off.
Processes: php-fpm uses pm = ondemand, so idle versions use almost no memory.

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