Question

How can I extract the common words between two or more paragraphs in php5?
I guess it might work to summarize each text to create a list of highly ranked words
and then compare them.

Answer 1

I guess the most basic way would be to :

• split each paragraph into an array of words, using either explode or preg_split
  • the first one might be a bit faster
  • the second one might provide a bit more options
• maybe, do some filtering on the list of words :
  • clean each word
    • removing special characters, like accented letters
    • converting everything to lower/upper-case, to help the comparisons you’ll be doing later
  • remove too common words
  • remove too short words
  • array_filter, here, could probably help
• and then, get the list of words that are in both arrays, using something like array_intersect