Best way...

I read records on a DB and concat the content to a string to write to the
browser.

I'd like to add a new feature.
If the content contains some word (prefilled list), then I must apply some
formatting (<b> tag)

My question is:
What is the better and faster way to do so ?
Should I fill a array and try with "in_array" function ?

It's there a better way ?

I noticed that Message-ID: <420b58e3$0$3407$5402220f@news.sunrise.ch>
from Bob Bedford contained the following:

 >I'd like to add a new feature.
 >If the content contains some word (prefilled list), then I must apply some
 >formatting (<b> tag)
 >
 >My question is:
 >What is the better and faster way to do so ?
 >Should I fill a array and try with "in_array" function ?
 >
 >It's there a better way ?

str_replace() will accept arrays.

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