JavaScript style camelcase to PHP style underscore and back

var-styles.js

// Underscore to camelcase
function usToCC(str) {
    return str.replace(/_([a-z])/g, function (g) { return g[1].toUpperCase(); });
}
// Camelcase to underscore
function ccToUs(str) {
    return str.replace(/([a-z][A-Z])/g, function (g) { return g[0] + '_' + g[1].toLowerCase() });
}