How to know that a triangle triple exists in our array?

Question

I was stuck in solving the following interview practice question:
I have to write a function:

int triangle(int[] A);

that given a zero-

Answer 1

PHP Solution :

function solution($x){
    sort($x);
    if (count($x) < 3) return 0; 
    for($i = 2; $i < count($x); $i++){
        if($x[$i] < $x[$i-1] + $x[$i-2]){
            return 1;
        }
    }

    return 0;
}