docs: workaround to use PHP in Composer scripts (#610)

* add @php workaround to known-issues.md

* minor tweaks

* switch to sh

Co-authored-by: Kévin Dunglas <kevin@dunglas.fr>

* Update known-issues.md: sh compat

* change language name

---------

Co-authored-by: Kévin Dunglas <kevin@dunglas.fr>

docs/known-issues.md

@@ -80,7 +80,7 @@ docker run \
     dunglas/frankenphp
 ```
 
-> ![CAUTION]
+> [!CAUTION]
 >
 > Be sure to replace `172.17.0.3` with the IP that will be assigned to your container.
 
@@ -96,3 +96,27 @@ docker run \
     -p 80:80 -p 443:443 -p 443:443/udp \
     dunglas/frankenphp
 ```
+
+## Composer Scripts Referencing `@php`
+
+[Composer scripts](https://getcomposer.org/doc/articles/scripts.md) may want to execute a PHP binary for some tasks, e.g. in [a Laravel project](laravel.md) to run `@php artisan package:discover --ansi`. This [currently fails]((https://github.com/dunglas/frankenphp/issues/483#issuecomment-1899890915)) for two reasons:
+
+* Composer does not know how to call the FrankenPHP binary;
+* Composer may add PHP settings using the `-d` flag in the command, which FrankenPHP does not yet support.
+
+As a workaround, we can create a shell script in `/usr/local/bin/php` which strips the unsupported parameters and then calls FrankenPHP:
+
+```sh
+#!/bin/sh
+
+# iterate over $@. if the current argument is -d, remove the argument and the next one
+for i in "$@"
+do
+    if [ "$i" = "-d" ]; then
+        shift
+        shift
+    fi
+done
+
+/usr/local/bin/frankenphp php-cli "$@"
+```