is there a way to permanently cache a text file into memory (php)?

I am creating a site that allows users to search a static text file.

The file is large static data txt file (10mb) that needed to be access/read every time a user searches (which is hopefully often).

Is there a way/technique that loads the content of the file and stored it in memory (and assigned a variable to it) permanently so that it would speed开发者_运维知识库 up the process?

Well, nothing could be permanently in RAM ;)

But if you've already APC installed, you can store it in there, or use memcached or Redis.

Using APC is the preferable way, cause you'll get opcode cache as well, which give you a performance boost, and it's just a PHP module. No need to setup another daemon.

Have you tried the php shared memory functions? Another possibility might to to use a RAM Disk.

You can use file_get_contents to get the entire file contents into a in-memory string variable.