Search Pattern Frequency

Question

Preferably PHP solutions -- but any ideas would be great.

Give a text blob

'This is a super string of some content whree I want to find red sweaters and purple elephants. The purple elephants will count twice. and the red sweaters will count 3 times since red sweaters occurs three times'

and a phrase list

'red sweaters, purple elephants'

want to search the text blob and return count of occurances

therefore

red sweaters = 3 and purple elephants = 2

Answer 1

http://www.php.net/manual/en/function.substr-count.php

$string = 'This is a super string of some content whree I want to find red sweaters and purple elephants. The purple elephants will count twice. and the red sweaters will count 3 times since red sweaters occurs three times';

$keys = 'red sweaters, purple elephants';

$pkeys = explode(', ', $keys);
foreach($pkeys as $key)
{
    printf("%s occourrences: %d\n", $key, substr_count($string, $key));
}