phpjs array_merge, formatted w/ tabs

array_merge.js

function array_merge() {
	// https://github.com/kvz/phpjs/blob/master/functions/array/array_merge.js
	var args = Array.prototype.slice.call(arguments);
	var argl = args.length;
	var arg;
	var retObj = {};
	var k = '';
	var argil = 0;
	var j = 0;
	var i = 0;
	var ct = 0;
	var toStr = Object.prototype.toString;
	var retArr = true;

	for (i = 0; i < argl; i++) {
		if (toStr.call(args[i]) !== '[object Array]') {
			retArr = false;
			break;
		}
	}

	if (retArr) {
		retArr = [];
		for (i = 0; i < argl; i++) {
			retArr = retArr.concat(args[i]);
		}
		return retArr;
	}

	for (i = 0, ct = 0; i < argl; i++) {
		arg = args[i];
		if (toStr.call(arg) === '[object Array]') {
			for (j = 0, argil = arg.length; j < argil; j++) {
				retObj[ct++] = arg[j];
			}
		}
		else {
			for (k in arg) {
				if (arg.hasOwnProperty(k)) {
					if (parseInt(k, 10) + '' === k) {
						retObj[ct++] = arg[k];
					}
					else {
						retObj[k] = arg[k];
					}
				}
			}
		}
	}
	return retObj;
}