Camel case to separator and vice-versa.

strings.php

<?php

/**
 * @param   string $string 
 * @param   string $separator 
 * @return  string
 */
function camelCaseToSeparator($string, $separator  = '-')
{
    return preg_replace('/(?<=[a-z])([A-Z])/', $separator . '$1', $string);
}

/**
 * @param   string $string 
 * @param   string $separator 
 * @return  string
 */
function separatorToCamelCase($string, $separator  = '-')
{
    $separator  = preg_quote($separator);
    return preg_replace("/({$separator})([a-zA-Z])/e", 'strtoupper("$2")', $string);
}

echo camelCaseToSeparator('HenriqueMoodyCarmo') . PHP_EOL;
echo separatorToCamelCase('henrique-moody-carmo') . PHP_EOL;