Help with algorithm to determine phrase occurrence in string in PHP

Posted by Will M. on Stack Overflow See other posts from Stack Overflow or by Will M.
Published on 2009-11-25T07:27:05Z Indexed on 2010/04/06 18:53 UTC
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php

I have an array of phrases (max 2 words) like

$words = array('barack obama', 'chicago', 'united states');

and then I have a string like:

$sentence = "Barack Obama is from Chicago. Barack Obama's favorite food it pizza.";

I want to find/create an efficient algorithm that would return the number of occurrences of the words in the array $words in the string $sentence. In this case it would be:

'barack obama' => 2
'chicago' => 0

How can I built this?

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Help with algorithm to determine phrase occurrence in string in PHP - Developer IT

Help with algorithm to determine phrase occurrence in string in PHP

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