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php incrementing grades in a file  RSS feed

daniel kidanee
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Hello, I am new to php and I am trying to do the following task. I fill I am doing it the longer way.
even, it is not working. Can any one help recommend an easy way of doing it? thank you!

Your task is to write a PHP script that reads grades from the file grades.txt, increments the grades by one and writes the incremented
grades to the file results.txt and finally prints the grades from results.txt. If the grade is five, it won't be incremented. The grades in
grades.txt are each in its own row and the amount of digits in a grade may vary. The grades are between 0-5. The grades written in
results.txt should each also be in their own rows.

Example output

My code:

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