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Reading large files, been there, done that. The problem is that most libraries just chunk the entire document into memory which is blocking. If the file is large, the file might not be parsed before PHP either runs out of memory or execution time expires. I suggest using one of two methods.

• Streaming: Allows you to load bits and pieces of the code into memory and work on each chunk.
• Generators: PHP generators work similar to streaming, but generators only allocate memory when you need it. I prefer using generators (available as of PHP5). Check this out.