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extract most common words in row of database titles

Posted on 2008-11-03
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I'm looking for an efficient solution to finding the most common words in a column of a database that comprises of text strings.

The solution would most likely be a combination of a mysql query and probably need some PHP to do some looping on results...

E.g. I have a table with 200,000 rows with a column for "titles" - these are names/titles of photos
I need a way to find the most common words in these 200,000 strings. This script need only run daily via a cron so it has room to be a little inefficient.
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Question by:mixart
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3 Comments
 
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Expert Comment

by:Sander Stad
ID: 22874099
You can use the str_word_count() function in PHP. At this website there are several examples how to search for repeating words: http://us3.php.net/manual/en/function.str-word-count.php.
What this function does it return an array with the words inside it. When you have the query you can loop the array to see if the word is already in your database.
The table with the words could look like this:
TABLE Words
-------------------------------------
Word                        Count
You loop through the array and than increment the count in the table if it already exists and if it doesn't exist add itto the table.
Hope this helps you out a bit
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Author Comment

by:mixart
ID: 22874917
This helps a little but I'm not quite there with figuring out the PHP code to do this.

Any chance you could help - if I had an array of strings like this:


$strings = ['The dog and cat run fast','A cat at a bird fast','The fast bird and cat jump','a dog run a cat','The cat fast run dog cat','A horse swim fast in a dog tree'];

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Accepted Solution

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Sander Stad earned 1500 total points
ID: 22885605
I thought it over and you'd also like to empty the table when the new job starts because you don't want the results from last time to get in the way of the new results.
It would look something like this:

<?php
$link = mysql_connect({SERVER}, {USERNAME}, {PASSWORD});
/* Delete all the old entries */
$query = "DELETE FROM wordstatictics";
$results = mysql_query($query, $link);
 
/*Get all the titles from the database */
$query = "SELECT titles FROM {TABLENAME}";
$results = mysql_query($query, $link);
 
/* Loop through the results */
while($result = mysql_fetch_array($results)){
  /*Get all the words inside an array */
  $words = array();
  $words = str_word_count($result['title'], 1));
  
  /* Call the function updateWordStatistics
  updateWordStatistics($words);
}
 
 
function updateWordStatistics($wordsArray = array()){
  /*Loop through every word, check if it already exists in the db
    If it doesn exist the count value is incremented by 1. If it 
    doesn't exists it is inserted in the table */
  foreach($wordsArray as $word){
    $query = "SELECT * FROM wordstatictics WHERE word = $word";
    $results = mysql_query($query, $link);
    if(mysql_num_rows($results) == 0){
      $query = "INSERT INTO wordstatistics(word, count) VALUES(\"$word\",1)";
      $results = mysql_query($query, $link);
    }else{
      $query = "UPDATE wordstatistics SET count = count + 1 WHERE word = $word";
      $results = mysql_query($query, $link);
    }
  }
}
 
mysql_close($link);
?>

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