Working with strings. Algorithm?

Question

PHP

Guys. Hello.
You need to write a script. Which will delete words from one text file "A" that are found in another text file "B".
I don’t really understand how to make this algorithm and what, let’s say, functions should be used?
But the most important thing is the algorithm!

Answer 1

The solution is to load both files into separate arrays and check element by element A for the presence of an element in B. According to the results of the check, delete / skip. Rewrite the resulting array to file A.

Answer 2

loop over each word from B, and str_replace

Answer 3

Recently, there seemed to be a similar question =) you also asked for a script. Yes?
file 1 (a=222, b=333, c=444, d=333), file 2 (222 333)
Result (c=444, d=333)
Super shitty code, but you get the point, I hope.

l = list()
with open('2.txt') as f:
  for line in f.readlines():
    l.append(line.replace('\n',''))

res = list()
with open('1.txt') as f2:
  for line in f2.readlines():
    res.append(line.replace('\n',''))


res = filter(lambda x: x.split('=')[-1] not in l, res)

with open('12.txt', 'w') as f2:
  for line in res:
    f2.write(line+"\n")

Answer 4

to start words from file 2 sort in descending order of line lengths