Edit in JSFiddle

window.addEventListener("load", function () {
    var list_elems_pure = document.querySelectorAll("li");
    for (var i in list_elems_pure) {
        if (list_elems_pure[i].innerHTML.match(/^php/i)) {
            list_elems_pure[i].style.backgroundColor = "#FF0";
        }
    }
});

function toArray(selector) {
    elems = document.querySelectorAll("li");
    ret_elems = [];
    for (var i in elems) {
        if (elems[i].nodeType == 1) {
            ret_elems.push(elems[i]);
        }
    }
    return ret_elems;
}