How to match one long string phrase against another and highlight the result

[sameerpanjwani]

I am a bit confused on how to go about doing a match of one string against another. This is what I want to achieve:

 

String 1: You have selected tea, biscuits and an ice-cream.

 

String 2: Tea, Coffee, Biscuits, Ice-cream, Chocolates, Fruits

 

I want to match "String 1" against "String 2" and return "String 1" with all the matching words highlighted in yellow. So in this case, "String 1" would return with "tea", "biscuits" and "ice-cream" highlighted in yellow.

 

How would I go about this?

[Maq]

Explode the string and compare each piece.  If the piece matches then highlight it.

[sameerpanjwani]

Would that be the most efficient way (exploding string 2 and then comparing it with each word in string 1) because string 2 can contain as many as 60-70 words and as much for string 1. Would it take a lot of processing time if the strings became that long?

[sameerpanjwani]

Ok I've made a mistake, string 2 is not necessarily in such an easy to decode format like mentioned above, it could be more like:

 

String 2: The items available are "Drinks - tea, coffee"; "Snacks - Biscuits", "Dessert - Ice-cream"

[Maq]

No.  The string examples you provided aren't very long.  Now, if you're processing 300,000 records of this length it could take a while.

[sameerpanjwani]

How would I explode the string without the quotes and commas being returned as part of the individual words returned.

[JasonLewis]

Like this?

 

$str1 = "The items available are \"Drinks - tea, coffee\", \"Snacks - Biscuits\", \"Dessert - Ice-cream\"";

//These are words that you want highlighted
$str2 = "Tea, Coffee, Biscuits, Ice-cream";

//Build the matches
$arr = explode(",", $str2);
$match = array();

foreach($arr as $highlight){
$match[] = "/{$highlight}/is";
}

echo preg_replace($match, "<span style='background-color:yellow;'>\\0</span>", $str1);