Delete lines after fgets () if condition is met in php

Question

I have a very large text file, I use fgets () to get the contents of the file line by line. but I need to delete some text from the file if a certain condition is met.

Example:

hello world am string number 1 hello world am string number 2

hello world am string A hello world am string B

lets say that the condition occurs on line 1, then I want to delete lines 1 and 2, but I do nothing for lines A and B

Answer 1

• Open this very large text file for reading. Call this file 1.
• Open a new file for writing. Call this file 2.
• Read the line from file 1.
• Check if the line meets your requirements.
• , 2.
• , .
• 1. , , .
• , 1 2 1. (, , , !)