Mounts directories from one PHP instance's filesystem into another using PROXYFS.
This enables file sharing between PHP instances without duplicating the files in memory.
For example, mounting /wordpress from the parent instance into a child worker allows
both to access the same WordPress installation without copying the entire directory.
The function automatically patches PROXYFS with mmap support before mounting, ensuring
libraries like ICU can memory-map data files through the proxied filesystem.
Mounts directories from one PHP instance's filesystem into another using PROXYFS.
This enables file sharing between PHP instances without duplicating the files in memory. For example, mounting /wordpress from the parent instance into a child worker allows both to access the same WordPress installation without copying the entire directory.
The function automatically patches PROXYFS with mmap support before mounting, ensuring libraries like ICU can memory-map data files through the proxied filesystem.