PHP Regular expression Conversion lowercase underline variable change hump type

PHP Regular expression Conversion lowercase underline variable change hump type

$method = ' Set '. Preg_replace (      "/(?: ^| _) ([A-z])/E ",              " Strtoupper (' \\1 ') ",              $f);

Such as

first_name, Setfirstname   Click_url, Setclickurl

The/E in the regular can be executed. This feature is also present in Perl.

If you can't do that, you can only

A-a B-B ... z-Z

I wonder if there is any other way.

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