Replacing a block of tags in a large xml file?

Question

PHP

The problem is a file and you need to replace the block in it. The file is big. Google solves the problem by reading the file line by line into a variable, replacing the necessary information and then all this information is immediately written to the file. For a large file, this is not an option. Further, you can still do a byte offset when opening a file. Everything seems to be in order here. But there is a significant minus - the current blocks are being overwritten, and the whole structure is moving. Roughly speaking, it is impossible to overwrite the middle of the file. Maybe with a text file, rewriting one line would work, but it doesn’t work here.
Can you tell me what are the exits?

Answer 1

Simple API for XML

Answer 2

in order to save memory, you can split the file into n (no, n is not enough, m) files, each of which is processed separately, and then glued together. Otherwise , Lentyuy is right - the tail is still sculpted separately.