php - How do I convert parts of the string to uppercase? -

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I have a string that I want to convert to uppercase besides the word 'and' which would always be surrounded by underscores is. / P>

then it becomes me_and_you ME_and_YOU does not always contain 'and' in the string, so it can be you me_you ME_YOU

Obviously strtoupper () makes the whole thing uppercase Do I have to use something like preg_split () or explosion ()?

You could probably write a regex to do this, but there would be an easy solution solution: 

  echo str_replace ('_ AND_', '_and_', strtoupper ($ your_string));

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