问题
I am reading(and slowly trying) the ways to interact with a txt file in php. I have already tried append and it adds data to the end of the txt file But how is a+ different from a
In w3schools it says:
a Append. Opens and writes to the end of the file or creates a new file if it doesn't exist
a+ Read/Append. Preserves file content by writing to the end of the file
What does a+ do differently and what does it actually "Preserve"
回答1:
With a you can just append to the end of the file.
With a+ you can read the file too, so you can move the file pointer using fseek and add content somewhere else inside the file.
来源：https://stackoverflow.com/questions/18057322/how-is-aread-append-different-from-aappend-in-php