If you dont want to stick to simplicity then use preg_replace()[docs]
preg_match('^(Thu|Fri|Sat)$', $yourtext, $matches, PREG_OFFSET_CAPTURE);
if(count($matches)) {
/// found
}
Author: Nabin Nepal (Starx)
Hello, I am Nabin Nepal and you can call me Starx. This is my blog where write about my life and my involvements. I am a Software Developer, A Cyclist and a Realist. I hope you will find my blog interesting. Follow me on Google+
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