Question

I have used a function for formatting in sentence case. My PHP script function is

function sentence_case( $string ) {
    $sentences  = preg_split(
        '/([.?!]+)/', 
        $string, 
        -1, 
        PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE
    );

    $new_string = '';
    foreach ( $sentences as $key => $sentence ) {
        $new_string .= ( $key & 1 ) == 0 
            ? ucfirst( strtolower( trim( $sentence ) ) ) 
            : $sentence . ' ';
    }
    $new_string = preg_replace( "/\bi\b/", "I", $new_string );
    //$new_string = preg_replace("/\bi\'\b/", "I'", $new_string);
    $new_string = clean_spaces( $new_string );
    $new_string = m_r_e_s( $new_string );
    return trim( $new_string );
}

Though its going well and converting whole string in sentence case. But I wish it would skip characters in single quote. Like my string HeLLO world! HOw aRE You. is converting to Hello world! How are you?, but I want to skip the content in the single quotes. Like I wish to skip words in the single quotes. 'HELLO' World and convert words in single quotes to uppercase, otherwise string should remain in sentence case.

Answer 1

You can add another simple regex callback to uppercase words in single quotes. (This is what I understood you want to do.)

$new_string = preg_replace("/'(\w+)'/e", 'strtoupper("\'$1\'")', $new_string);

If you want this to work for more than one word per quote, use [\w\s]+ in place of \w+. However that would make it more likely to fail for phrases like isn't within the text.